The engineering manager at FXO Plastics wants to complete an alternative evaluation study. She asked the finance manager for the corporate MARR. The finance manager gave her some data on the project and stated that all projects must clear their average (pooled) cost by at least 4%. Use the data to determine the minimum before-tax MARR. Source of Funds Amount, $ Average Cost, % Retained earnings 4,000,000 7.4 Stock sales 6,000,000 4.8 Long-term loans 5,000,000 9.8