Answer (B) is correct . The key to this question is, what costs will the company avoid if it buys from the outside supplier? It will no longer incur the $2.00 of direct materials, nor the $2.40 of direct labor, nor the $1.60 of variable overhead, nor $0.75 ($2.50 ¡Á 30%) of the variable marketing costs (regardless of whether the company makes or buys, it will still incur 70% of the variable marketing costs). The firm will therefore avoid costs of $6.75 ($2.00 + $2.40 + $1.60 + $0.75). Hence, it will at least break even by paying no more than $6.75. Answer (A) is incorrect because The amount of $8.50 assumes that all variable marketing costs are avoidable. Answer (C) is incorrect because The amount of $7.75 assumes that fixed manufacturing costs of $1 are avoidable. Answer (D) is incorrect because The amount of $5.25 results from subtracting the savings in marketing costs from the manufacturing savings.
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