Stenback Company manufactures and sells a single product. The companys sales and expenses for last year follow: Click the icon to view the information.) Read the reguirements. Requirement 1 Fill in the missing numbers in the table. Enter the percentages as whole numbers, "XX' Total Per Unit Sales 25 Variable expenses Contribution margin 12.500 Fixed expenses 37,500 Operating income a. What is the total contribution margin? The total contribution margin is S b. What is the per unit contribution margin? The per unit contribution margin is c. What is the operating income? The operating income is S d. How many units were sold? units were sold