Please explain as well

COLLEGE O F Management Cxe IV. Compute the missing amounts for the income statement for each independent case. Case A $800 100 500 600 Case B Case C Sales revenue Beginning inventory Purchases Total goods available for sale Ending inventory Cost of goods sold Gross margin Expenses Net Income $800 1 $ 90 420 160 340 150 110 400 (50) 420 60 300