managerial accounting: show formulas please

B D E F G EX 7 (4 points) Multi Company makes three products. To follow is the financial and production data per unit: Prod A Prod B Prod C Sales price $21.00 $28.00 $35.00 Variable costs $15.75 $24.50 $25.20 Contribution margin per unit $5.25 $3.50 $9.80 Direct material required per unit (in lbs) 3 1 4 Due to problems with suppliers, Multi Company only has 4200 pounds of material available. Assume product demand of 500 units for product A, 2000 units product B and 400 units product C. Prod A Prod B Prod C What is the most profitable sales mix in units? What is the total contribution margin at ideal sales mix