Demand for a book at Amazon.com is 400 units per week. The product is supplied to the retailer from a factory. The factory pays $9 per unit. while the total cost of a shipment from the factory to the retailer when the shipment size is Q is given by

Shipment cost = $83 + 2Q

Assume the annual inventory carrying cost is 32 percent.

Please help with part B and C!!!!!!!!

a-1. What is Amazon's total cost per shipment? Answer is complete and correct. a-2. What is the annual holding cost per book? (Round your answer to 2 decimal places.) Answer is complete and correct. b. What is the optimal shipment size? (Assuming 52 weeks per year. Round your answer to the nearest whole number.) Answer is not complete. c. What is the average throughput time? (Do not round intermediate calculations. Round your answer to 3 decimal places.) Answer is not complete