Answer: Income will increase by $16 per unit
Step-by-step explanation:
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The effect on income if Derby decides to make the motors will be calculated thus:
In-house:
Direct material = 38
Direct labor = 50
Overhead (Incremental) = 21
Total variable cost = 109
Outside:
Cost of supply = 125
Therefore, the income per unit will increase by (125 - 109) = 16.