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Costing

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COST ACCOUNTING II
MARGINAL COSTING AND
DECISION MAKING
Prepared by
Teddy Ossei Kwakye

Lesson Objectives
Distinguish between relevant and irrelevant revenues and costs

Analyze relevant costs and indicate how they differ under alternative decision scenarios Apply differential analysis to decision scenarios, including discontinuation decisions; to accept a special order; to make or buy and to sell or further process a product
Allocate limited resources for purposes of maximizing short-run profit

Decision Making Process
Objectives Setting
• Relates to the future, hence decisions are future oriented
Determination of Alternatives
• Different alternatives to achieving the objectives, hence decision is a choice of alternatives

Evaluating the alternatives
• Requires complete, timely, relevant and reliable information
Choosing the best alternative

• Alternative chosen should be the one that maximizes the objectives

Relevant Information
Information that is affected by a decision
• Information that is independent or has nothing to do with decision is irrelevant
Types / Kinds
• Quantitative information - Elements that can be expressed in monetary terms
• Qualitative information - Factors that are difficult to quantify in monetary terms e.g. moral of employees, customer goodwill etc.

Quantitative Relevant Information
Relevant Costs and Revenues
• Costs (revenues) that flow from the decision
• Future or expected costs (revenues)
• Must differ between the alternatives under consideration

Examples






Incremental costs (revenues) are relevant
Past costs (sunk costs) are not useless but irrelevant
Common costs (revenues) to the alternatives are irrelevant
Costs (revenues) that will not change by a decision are irrelevant
Avoidable costs are relevant and unavoidable cost are irrelevant

Quantitative

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