how do you caculate the missing account?

Brief Exercise 6-4 Calculate amounts related to the multiple-step income statement (L06-2) For each company, calculate the missing amount Cost of Goods Sold Company Lennon Harrison McCartney Starr Sales Revenue $ 17.400 19,100 12,400 15,400 10,700 8,700 5,700 Gross Operating Profit Expenses Net Income $ 7,700 $ 3,350 $ 4,350 5,700 2,700 3,700 1,350 9,700 6,350