DELL is a small producer of metal parts supplies a larger assembly company, with 20,000 wheel bearings each year. This order has been stable for some time. Setup cost is $50, and holding cost is $0.80 per wheel bearing per year. They can produce 600 wheel bearings per day. DELL is a just-in-time manufacturer and requires that 60 bearings be shipped to it each business day. a) What is the optimum production quantity (POQ)? b) What is the total setup plus holding cost (TC)