a particular surgical implant costs $1500 and it costs $250 to process an order for any quantity of implants. the annual carrying cost per implant is 21% of the purchase price. demand is 20 per week. what is the economic order quantity for this implant? what is the average cycle stock inventory level for implants if the economic order quantity is used? what is the total annual carrying cost plus order processing cost for implants if the economic order quantity is used?