13-7) A jewelry firm buys semiprecious stones to make bracelets and rings. The supplier charges $38 per stone, annual carrying costs are 23%, and the cost of processing orders is $32. The jewelry firm operates 250 days per year and their usage rate is 73 stones per day.

a )What is the best order batch size for semi-precious stones?

b) What is the annual cost of holding precious stones in inventory?

c) How many orders per year will be placed for semi-precious stones?

d) What is total annual cost to order and hold semi-precious stones?