Suppose you purchase a $4 -per-unit part from a supplier with which you assemble red widegets. On average, you use 50000 units of this part each year. Every time you order this part, you incur a sizable order cost of $800 regardless of the number of parts you order. Your cost of capital is 20% per year.

a)how many parts should you purchase each time you place an order?
b)To satisfy annual demand, how many times per year will you place orders for this part?