A factory manufactures two products A and B. To manufacture one unit of A, 1.5 machine hours and 2.5 labour hours are required. To manufacture product B, 2.5 machine hours and 1.5 labour hours are required. In a month, 300 machine hours and 240 labour hours are available. Profit per unit for A is Rs 50 and for B is Rs 40. Find out by using the simplex method, the optimal units of the products A and B required to be manufactured per month to maximise the profit.