Step 6: What is the gross profit for the new bill? FORMULA - as GP % are no longer the same as step 2. New Sales less COGS less complimentary discounts = New GP Accounting Formula - via COGS deductions and discounts a) (Step 5 total bill) less (food items x 0.3 + step 5 drink items x 0.2) b) Answer above less step 4 Or Mathematic Formula (easiest way) a) Step 5 food items x 0.7 + step 5 drink items x 0.8 b) Answer above less step 4