Ajewelry firm buys semiprecious stones to make bracelets and rings. the supplier quotes a price of $8.40 per stone for quantities of 600 stones or more, $8.50 per stone for orders of 400 to 599 stones, and $10 per stone for lesser quantities. the jewelry firm operates 222 days per year. usage rate is 25 stones per day, and ordering costs are $48. a. if carrying costs are $2 per year for each stone, find the order quantity that will minimize total annual cost.