A finished product must weigh exactly 150 grams. The two raw materials used in manufacturing the product are A, with a cost of Rs 2 per unit and B with a cost of Rs 8 per unit. At least 14 units of Band not more than 20 units of A must be used. Each unit of A and B weighs 5 and 10 grams respectively.

How much of each type of raw material should be used for each unit of the final product in order to minimise the cost? Use Simplex method