Answer (B) is correct . Differential (incremental) cost is the difference in total cost between two decisions. The relevant costs do not include unavoidable costs, such as the $3 of fixed overhead. It would cost ABC an additional $20,000 to purchase, rather than manufacture, the components. Purchase price (12,000 ¡Á $37) $444,000 Minus:??rental income (40,000) Net cost to purchase? $404,000 Cost to manufacture (12,000 ¡Á $32) (384,000) Cost differential $??20,000Answer (A) is incorrect because This figure assumes that $3 of fixed overhead is avoidable. Answer (C) is incorrect because This figure compares the full cost of manufacturing with cost to purchase. Answer (D) is incorrect because This figure ignores the opportunity cost.
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