please help with both portions and show all work please

Multi Company makes three products. To follow is the financial and production data per unit: Prod A Prod B Prod C Sales price $15.00 $20.00 $25.00 Variable costs $11.25 $17.50 $18.00 Contribution margin per unit $3.75 $2.50 $7.00 Direct material required per unit (in lbs) 3 1 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. 4 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