This is a fill in the blanks, I am not sure how I should be calculating.

E7-3 (Static) Inferring Missing Amounts Based on Income Statement Relationships L07-1 Enter the missing dollar amounts for the income statement for each of the following independent cases: Cases Sales Revenue Total Available Gross Profit Expenses Ending Inventory $ 500 Cost of Goods Sold $ 300 Pretax Income (Loss) A $ $ 650 1,100 Beginning Purchases Inventory $ 100 $ 700 200900 150 550 900 150 200 150 100 200 C 200 4001 300 300 200 800 1,000 1,100 500 (50)