Fill in the blanks for each of the following independent cases. Unit Unit Variable Number Total Total Selling Price Operating Costs of Units Contribution Fixed Operating Income Case Sold Margin Costs $ 70 $25 $. S 900,000 $. $ 200,000 a b 62 15,000 250,000 125,000 250 30,000 4,500,000 900,000 150 24,000 1,728,000 1,500,000