15. Elise Corporation has the following sales mix for its three products: A = 20%; B = 35%; and C = 45%. Fixed costs total $400,000 and the weighted- average contribution margin, aka the combined contribution margin for all three products after factoring in the sales mix, is $100. How many units of product A must be sold to break-even? A. 800 B. 4,000 C. 20,000 D. 80,000 E. Cannot be determined based upon the information presented