(1) XLtd manufacture 3 products for which details are as follows: Sales demand for the period is limited as follows: The supply of labor is limited to 90,000 hours per period. 1) Calculate contribution per unit for X Ltd. Manufacture. ( 5 marks) 2) Calculate contribution per labor hours per unit. (5marks) 3) Rank the products in relation to labor hour rate. (5 marks) 4) Draw up a production schedule showing how X Ltd. Manufacture would maximize profit in spite of the constraint