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Rocky Mountain Tire Center sells 9,000 go-cart tires per year. The ordering cost for each order is $40, and the holding cost is 30% of he purchase price of the tres per ye e the pur hint proe in $20 per tire if fewer than 200 tires are ordered; $18 per tire it 200 or more-but ferwer than B,000- tirns are ordered, and $14 per tire it 8.000 or more ires are oidered a) How many tires should Fiocky Mountain order oach time it places an order? Rocky Mountain's optimal order quantity is units (enter your response as a whole numbed