Al Kamel manufactures two types of doors, D1 and D2. Costing information for products D1 and D2 is set out below: Required: 1- Calculate the contribution per unit for each product, and show which one is the most profitable for the company.( 10 marks) 2- The fixed costs are allocated based on the units produced. Calculate the selling price per unit of each product to reach a profit margin of 15%. ( 10 marks) 3- The Company has a maximum working capacity of 815 labor hours. Labour hours are paid at a rate of $16 per hour. Show which production plan is most profitable for the Company