8) A man owns two building supply stores, one on the east side and one on the west side of the city. Two customers order some inch plywood. Customer A needs 50 sheets and customer B needs 70 sheets. The east side store has 80 sheets and the west side store has 45 sheets of this plywood in stock. The east side store’s delivery costs per sheet are RM0.50 to customer A and RM0.60 to customer B. The west side store’s delivery costs per sheet RM0.40 to customer A and RM0.55 to customer B. How many sheets should be shipped from each store to each customer to minimize delivery costs?