VGHC operates its own laboratory on-site. The lab maintains an inventory of test kits for a variety of procedures. VGHC uses 780 AIC kits each year. Ordering costs are $15 and holding costs are $3 per kit per year. The new price list indicates that orders of fewer than 73 kits will cost $60 per kit, 73 through 144 kits will cost $56 per kit, and orders of more than 144 kits will cost $53 per kit. Determine the optimal order quantity and the total cost.