One way to find the missing amounts would be to prepare a contribution format income statement for each case , enter the known data and then compute the missing items . Assume only one product is being sold in each of the 4 cases . Case Unit sold Sales Variable expenses Contrib. margin Fixed Net 1 9000 270,000 162,000 90,000 18,000 2 350,000 15 170,000 40,000 3 20,000 280,000 6 35,000 4 5000 160,000 82,000 12,000