Readymix Ltd manufactures three products: Product RR, Product DD and Product MM. The contribution per unit of the respective products is as follows: Product RR Product DD Product MM Contribution per unit 420 320 620 The manufacture of these products involves two processes: Process Ready and Process Mix. The processing time requirements of each product (in hours) are as follows: Product RR Product DD Product MM Process Ready 25 50 40 Process Mix 35 40 The monthly processing time of Process Ready and Process Mix is limited to 50,000 hours and 80,000 hours respectively. The sales of Product RR are limited to 900 units per month due to regulatory restrictions. The objective of the company is to maximise contribution. 55 Required: a) Using the simplex method, determine the optimal production plan. You should show and clearly explain all workings. Your answer should be rounded to 3 decimal places