just need question A

MZ_IND6. Cavendish Convenience Stores purchases 1000 U.S. Road Maps a year for its inventory from its supplier, who offers pricing at quantity discounts. The cost for Cavendish to place an order is $42, and the annual carrying cost is 15%/year. What quantity should Cavendish order? The quantities and pricing from this supplier are shown in the following table: I ORDER QUANTITY 0-149 150-349 350-999 1000 or more UNIT PRICE $12.00 $11.70 $11.50 $11.20 a) What is the EOQ when the unit price is $12? b) What is the total cost (holding+ purchase+ ordering) when purchasing from the supplier where the unit price is $11.70? c) What is the total cost (holding+ purchase+ ordering) when purchasing from the supplier where the unit price is $11.50? d) What is the total cost (holding+ purchase+ ordering) when purchasing from the supplier where the unit price is $11.20? e) Based on the total costs, what quantity should be ordered from the supplier