question content area contribution margin united merchants company sells 26,000 units at $35 per unit. variable costs are $21.35 per unit, and fixed costs are $124,200. determine (a) the contribution margin ratio, (b) the unit contribution margin, and (c) operating income. a. contribution margin ratio (enter as a whole number.) fill in the blank 1 % b. unit contribution margin (round to the nearest cent.) $fill in the blank 2 per unit c. operating income