How to Crack CA Inter Costing — Practice

Question 1

A company's ledger shows: factory rent, sales commission, abnormal spoilage in production, and the finance director's salary. Explain how each should be classified before any cost sheet is built, and state the general principle this illustrates.

Accepted Answer

Factory rent is a factory overhead, a product cost, and is absorbed into the cost of production as part of Works Cost, since it is a cost of running the facility where goods are made. Sales commission is a selling and distribution cost, a period cost connected with securing and fulfilling sales, and belongs after Cost of Production in arriving at Cost of Sales, never inside factory cost, however tempting it might be to treat all overheads as one undifferentiated pool. Abnormal spoilage in production is neither an ordinary product cost nor a period cost in the usual sense; it is an abnormal loss, costed separately and charged to the costing profit and loss account rather than absorbed into the cost of the good units that were actually produced without defect, since folding it into good units' cost would inflate the cost of units that had nothing to do with the spoilage. The finance director's salary is an administrative overhead, a period cost unconnected with production, and is treated similarly to selling costs, entering the computation after Works Cost rather than within it. The general principle is that classification must happen before any number is computed: the correct place for each item in the cost sheet depends on what kind of cost it is, and getting the classification wrong corrupts every subsequent total even where the individual figures and the arithmetic are entirely accurate.

Question 2

Explain why drilling the cost sheet format is described as more valuable than memorising individual cost formulas, using unit costing as an example of a chapter that depends on it.

Accepted Answer

A formula memorised in isolation is fragile: under exam time pressure, a candidate who has learned formulas as disconnected facts, rather than as steps within a larger structure, loses the thread the moment one input is uncertain or a question is phrased slightly differently from the practice problems studied. The cost sheet format, by contrast, is a sequence — Prime Cost, then Works Cost, then Cost of Production, then Cost of Goods Sold, then Cost of Sales — and once that sequence is genuinely automatic, it tells the candidate what to compute next at every stage, regardless of which specific numbers a particular question supplies. Unit costing illustrates this directly: a unit costing question is, at its core, the ordinary cost sheet applied to compute the cost of a single unit of homogeneous output, with the specific twist that direct materials, direct labour and overheads are all expressed per unit rather than in total. A candidate who has the cost sheet format automatic recognises unit costing immediately as a variation on a structure already mastered, and spends their attention on the problem's actual numbers rather than on recalling what comes after what; a candidate who has only memorised isolated formulas for unit costing specifically has to relearn a version of the same structure from scratch, with no transfer from anything studied earlier, and is correspondingly slower and more error-prone under pressure.

Question 3

A candidate computes a material cost variance and is unsure whether the result should be labelled favourable or adverse. Describe the discipline that resolves this reliably, and explain why memorising the symbolic formula alone is an unreliable substitute.

Accepted Answer

The reliable discipline is to write the variance formula out in words before substituting any numbers: standard cost of actual output minus actual cost. Doing so forces the candidate to think through what is actually being compared, rather than mechanically applying a remembered arrangement of symbols whose sign convention may be misremembered or misapplied under pressure. Once the words are written, the arithmetic follows directly: if the standard cost of actual output exceeds the actual cost incurred, the variance is favourable, since less was spent than the standard allowed; if actual cost exceeds the standard cost of actual output, the variance is adverse, since more was spent than the standard allowed. Memorising the symbolic formula alone is unreliable because a symbol carries no inherent meaning under exam stress; a candidate who has learned the letters SC minus AC as an abstract sequence, without the underlying sense of what each stands for and why the subtraction runs in that direction, is one slip away from reversing the sign, and sign errors of exactly this kind are the single most common way marks are lost in the standard costing chapter, precisely because the arithmetic itself, once the correct figures are identified, is straightforward and rarely the actual source of error. Writing the formula in words every single time, even when it feels unnecessary, is what makes the discipline reliable rather than occasionally reliable.

Question 4

A company is deciding whether to accept a one-off special order at a price below its normal selling price. It has idle capacity. Explain, using the marginal costing 'one idea', which costs are relevant to this decision and which are not, without doing any arithmetic.

Accepted Answer

The governing idea is that a cost is relevant to a decision only if it changes as a result of that decision; a cost that will be incurred regardless of what is decided is not relevant, however large it is or however naturally it might seem to belong in a costing computation. Variable costs of producing the additional units for the special order, materials, direct labour and variable overhead that scale with output, are relevant, because accepting the order causes these costs to be incurred that would not otherwise arise, and rejecting the order avoids them. Existing fixed costs of the factory, such as rent, depreciation on existing plant, and the salaries of permanent supervisory staff, are not relevant to this decision if the company has idle capacity, because those costs will be incurred in exactly the same amount whether the special order is accepted or rejected; they do not change with the decision and are therefore sunk or unavoidable in this context, and including them in the analysis, for instance by allocating a share of fixed overhead to the special order units and concluding the order is unprofitable on that basis, would be a classic and specifically warned-against error. The correct approach compares the special order's incremental revenue against only its incremental (variable) cost, since it is the change in total cost and total revenue that the decision actually causes that determines whether accepting the order improves the company's position, and fixed costs already being incurred regardless play no part in that comparison.

Question 5

State the rule on attempting the 30-mark objective section of this paper, and contrast it with the corresponding rule at CA Foundation level.

Accepted Answer

At CA Intermediate, every objective question should be attempted, without exception, because there is no negative marking on the objective portion of any Intermediate paper; an unattempted question is worth exactly zero, and any answer, even a guess, is worth strictly more than zero in expectation, so there is never a reason to leave one blank. This differs from CA Foundation, where Papers 3 and 4 carry a 0.25 penalty for a wrong answer, though even there the correct rule is still to attempt everything, since with four options a blind guess still has a positive expected value of 0.0625 marks, the penalty being milder than the one-third figure that would make guessing break even. The practical consequence at Intermediate level is simpler than at Foundation: there is no arithmetic to work through at all, since guessing carries no downside whatsoever, so the rule can be stated and applied without any further justification needed.

Question 6

Explain the recommended ratio of problem-working time to reading time for this paper, and why it should never fall below roughly one to one.

Accepted Answer

The recommended discipline is to work at least three problems immediately after reading each chapter, without the book open, keeping problem-working time at least equal to reading time rather than allowing reading to dominate preparation. The reason this ratio should never fall below roughly one to one is that costing is tested through numerical application, not recall of definitions, and reading alone produces recognition without recall: material read carefully feels familiar and understood, because recognising a worked example when it is placed in front of you is genuinely easier than reproducing the method from a blank page, and nothing in a reading-only routine tests the harder skill an examination actually demands. A candidate who reads three chapters for every one chapter they practise problems on accumulates a false sense of preparedness that only becomes visible, expensively, in a mock test or the actual examination, when the blank page finally arrives and the gap between recognition and production is exposed. Maintaining the ratio close to one to one throughout preparation, rather than deferring problem practice to a later revision phase, closes that gap while there is still time to fix it.

Question 7

Explain why the method chapter describes this paper as the most predictable in Group II, and what discipline this predictability rewards above all others.

Accepted Answer

A correctly worked numerical answer in this paper is unambiguously right, with no examiner discretion over whether prose adequately captured a point, unlike the two written papers in Group II, Auditing and Ethics and Financial Management and Strategic Management's written half, where the same underlying knowledge expressed slightly differently can score quite differently depending on how persuasively and precisely it is phrased. This predictability means that a candidate who has genuinely mastered the computational techniques in this paper can expect their marks to track their preparation closely, without the additional variance a written paper introduces through presentation quality and an examiner's judgement calls. What this predictability specifically rewards is disciplined classification before computation: because the arithmetic itself, once the right numbers are identified and placed correctly, is rarely the actual source of error, the marks in this paper are overwhelmingly won or lost at the classification stage, exactly the stage the method chapter's central warning addresses, deciding what kind of cost each item is and where it belongs before touching a calculator. A candidate who has internalised that discipline finds this paper's marks the most reliable in the level; one who has not finds that a paper which should be entirely within their control produces surprising, hard-to-diagnose losses.

Practice — How to Crack CA Inter Costing

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