Explain the answer in terms of marginal benefit and marginal loss

ov marks) 1. Mark buys an old airplane with the intention of repairing, restoring, and selling it. He anticipates that it will cost him $295,000 to purchase, repair, and restore the plane, and that he can sell the finished plane for $350,000. When he has spent a total of $295,000 on the project, he discovers that he needs to replace the engine. It will cost Mark $100,000 to replace the engine. He can sell the plane without the new engine for $220,000. What should he do? Explain. How much money does Mark make/lose overall on the project? In your answer, refer to the marginal benefits and marginal costs of each option. (4 marks)