Detailed Answer
Answer (D) is correct. The company will need to cover its variable costs and any other incremental costs. Thus, direct materials ($200,000) direct labor ($150,000) the supervisor’s salary ($20,000), and fringe benefits on direct labor ($15,000) are the incremental unit costs of manufacturing the engines. The breakeven price is therefore $385,000 ($200,000 + 150,000 + 20,000 + 15,000)