Rocky Mountain Tire Center selis 10,000 go-cart tires per year. The ordering cost for each order is $35, and the holding cost is 30% of the purchase price of the tires per year. The purchase price is $20 per tire if fowor than 200 tires are ordered, $19 per tire $200 or more, but fewer than 8,000 , tires are ordered, and $14 per. bire if 8,000 or more tires are ordered. a) How many tires should Rocky Mountain order each time it places an order? Rocky Mountain's optimal order quantity is units (enter your response as a wholo number) b) What is the total cost of this policy? Total annual cont of ordering optimal order size = $ (round your response to the nearest wholo number)