Below is a spreadsheet of purchase orders for a computer hardware retailer. To find the total order cost, what Excel formula should be used in A12? A B C D E F G H 1 Purchase Orders 3 Supplier Item Description item Cost Quantity Cost per Order A/P Terms (Months) Order No. Order Size 4 Rex technologies Graphics Card S 89 35 S 3.115 20 AL123 Large 5 Rex technologies Monitor 150 15 S 2.250 25 AL234 Small 6 Rex technologies Keyboard 15 40 600 15 AL345 Large 7 Rex technologies Speakers 15 20 S 300 25 AL456 Small 8 Max's Wavetech HD Cables 5 10 S 50 25 KO876 Small 9 Max's Wavetech Processor 278 27 S 7.506 30 KO765 Large 10 Max's Wavetech Hard disk S 120 18 S 2,160 20 KO645 Small 11 12