13-4 McBurger orders ground meat at the start or each week to cover the week's demand or 300 lb. The xed cost per order is $20. It costs about $.03 per lb per day to refrigerate and store the meat. (a) Determine the inventory cost per week of the present ordering policy. (b) Determine the optimal inventory policy that McBurger should use, assuming zero lead time between the placement and receipt of an order