Requirements 1. Calculate Marston's 2020 contribution margin percentage, breakeven revenues, and degree of operating leverage under the two scenarios. 2. Describe the advantages and disadvantages of each type of sales alternative. 3. In 2021, Marston uses its own salespeople, who demand a 15% commission. If all other cost behavior patterns are unchanged, how much revenue must the salespeople generate in order to earn the same operating income as in 2020? -