1. Compute the ritt contribution margin and the units that must be sold to break even. 2. Suppose 15. o0 units are sold above breakeven. What is the operating income? 3. Compute a contribution margin ratio. Use the controution margin ratio to compute the break-even point in sales revenue. (Mote: Round the contribution a argin ratio to four decimal places before converting to a percentage (for example, 0.80378 would be rounded to , 8038 , and entered as 80.38% ), ar round the sales revenve to the nearest dollar.) Contributic margin ratio