Sam Company Ltd. produces a range of products and absorbs production overhead using a rate of 168% on direct wages. The absorpti

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问题 Sam Company Ltd. produces a range of products and absorbs production overhead using a rate of 168% on direct wages. The absorption rate was calculated from following budgeted figures:

Direct wages 100,000
Fixed production overhead 90,000
Variable production overhead 78,000
Sam is making component W, which is an essential part of product M. The cost of making component W is as follows:

Raw material 10
Direct wages 8
Production overhead 18
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It is found that component W could be bought from an outside supplier at $21. It is unlikely to reduce any production costs even if component W is acquired from outside.
Required:
(a)Determine the overhead absorption rate.
(b)Advise whether the company should continue making component W or buy it from outside.

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答案(a)The overhead absorption rates are determined as follows: Variable overhead rate = Variable production costs / Direct labour costs = 78,000 / 100,000 = 78% Fixed rate overhead = Fixed production costs / Direct labour costs = 90,000 / 100,000 = 90% Total rate = 78% + 90% = 168% (b)Marginal cost for unit of component W: $ Raw material 10 Direct labour 8 Variable overhead ($8×78%) 6.24 24.24 The outside supplier’s quotation of $21 is lower as compared with the variable cost of making component W. Thus, buying component W from outside would save $3.24 per unit and is recommended.

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