From the invoice, extend each line to the total column and calculate the invoice subtotal and invoice total: Stock # Quantity Unit Merchandise Description Unit Price Total ea $ 2839 1612 3218 3318 28 15 2 8 ea gro bx Staplers 2-tier trays #2 pencils 3x5 index cards Invoice Subtotal Shipping Charges Invoice Total $9.20 3.19 21.60 5.26 51.98 $ ca