Suppose that Westside Auto of Problem 4, with D = 12,000 units per year, Ch = (2.50)(0.20) = $0.50, and C0 = $25, decided to operate with a backorder inventory policy. Backorder costs are estimated to be $5 per unit per year. Identify the following:a. Minimum-cost order quantityb. Maximum number of backordersc. Maximum inventory leveld. Cycle timee. Total annual cost