One of Sun Appliance's products is a dishwasher. Two processing departments are involved in the dishwasher's manufacture. The tub is assembled in one department, and a second department assembles and installs the motor. There is no beginning or ending work in process in either department. During March, the company incurred the following costs in the manufacture of 4,000 dishwashers. Tub Motor DepartmentDepartment Direct materials Direct labor Manufacturing overhead 160,000 15,000 25,000 $ 80,000 20,000 12,000 Required: a-1. Compute the cost per-unit of a tub assembly transferred to the Motor Department for the month of March. a-2. Compute the cost per-unit of assembling a motor and installing it for the month of March. a-3. Compute the cost per-unit of a completed dishwasher for the month of March a-4. Compute the cost per-unit of materials used in assembling a tub for the month of March a-5. Compute the cost per-unit of direct labor cost of assembling and installing a motor for the month of March. b. Which of these unit costs would be most useful to management in evaluating the overall monthly efficiency of the Motor Department