Along with 2 other projects, Yolo, Inc. built a custom boat for Don Johnson in December. Direct labor in the production division was $36,000 for 1,200 hours. The Johnson project accounted for 400 of those hours and used up raw materials inventory of $100,000. Rent and insurance on the factory were $24,000. Selling and administrative costs were $120,000. Yolo assigns manufacturing overhead based on direct labor hours. According to the job cost sheet, how much did the boat cost to build?

Textbook gives the answer as $120,000 but I cannot figure out how they got that answer.