Fill in the missing amounts in each of the eight case situations below. Each case is independent of the others. $($Hint: 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.$)$ Required: a$.$ Assume that only one product is being sold in each of the four following case situations: Complete this question by entering your answers in the tabs below. Required A Assume that only one product is being sold in each of the four following case situations: Case #$1$ Case #$2$ Case #$3$ Case #$4$ Unit sold $9,80020,3004,800$ Sales $$333,200$ $$367,200$ $$446,600$ $$144,000$ Variable expenses $196,000203,000$ Fixed expenses $91,000166,00089,000$ Net operating income $($loss$)$ $$(2,800)$ $$158,600$ $$(17,000)$ Contribution margin per unit $$12$ $$12$