Product LM can be produced by machine A or machine B. Machine A can produce 15 units of LM per hour and B takes 25 units per hour. The total machine hours available are 7,500 hours per annum. From the following comparative costs and selling price, you are required to determine the profi table method of manufacture:

Direct materials Direct labour Overhead: Per Unit of Machine A Product LM- Machine B Rs. Rs. 30 30 15 20 Variable 17 22 Fixed 8 28 Total costs 70 80 Selling price 75 75