17) A sporting goods store determines that the optimal quantity of athletic shoes (in pairs) to 17) order each month is given by the Wilson lot size formula: Q(C, M, s) = , 2CM s , where C is the cost (in dollars) of placing an order, M is the number of pairs sold each month, and s is the monthly storage cost (in dollars) per pair of shoes. Find aQ ac Then find and interpret aQ ac (100, 500, 3) Answer: ae M aQ ac 2Cs aC (100, 500, 3) = 0.91; the optimal quantity increases by about 1 pair per order for each dollar increase in the cost of placing an order