13 Illustration 42 A manufacturing company uses two identical large and four identical small machines. Each large machine occupies one quarter of the workshop and fully employs three workers ; each small machine occupies half the space of a large machine and fully employs two workers. The workers are paid by piece work. Each of the six machines is estimated to work 1,440 hours per year, while the effective working life is taken as 12,000 working hours for each large machine and 9,000 working hours for each small machine. Large machines cost Rs. 20,000 each, and small machines Rs. 4,000 each. Scrap values are Rs. 4,000 and Rs. 100 respectively. Repairs, maintenance and oil are estimated to cost for each large machine Rs. 4,000, and each small machine Rs. 1,200, during its effective life. Power consumption costs 5 P. per unit, and amounts for a large machine to 20 units per hour, and for a small machine to 2 units per hour. The manager is paid Rs. 4,800 a year, and the workshop supervision occupies half his time which is divided equally among the six machines. Details of other expenses are : Rent and rates of the workshop : Rs. 6,400 a year. Lighting (to be apportioned in the ratio of workers employed) Rs. 1,820 a year. Taking a period of three months as a basis, calculate the macuine hour rate for a large machine and a small machine respectively. 13 Illustration 42 A manufacturing company uses two identical large and four identical small machines. Each large machine occupies one quarter of the workshop and fully employs three workers ; each small machine occupies half the space of a large machine and fully employs two workers. The workers are paid by piece work. Each of the six machines is estimated to work 1,440 hours per year, while the effective working life is taken as 12,000 working hours for each large machine and 9,000 working hours for each small machine. Large machines cost Rs. 20,000 each, and small machines Rs. 4,000 each. Scrap values are Rs. 4,000 and Rs. 100 respectively. Repairs, maintenance and oil are estimated to cost for each large machine Rs. 4,000, and each small machine Rs. 1,200, during its effective life. Power consumption costs 5 P. per unit, and amounts for a large machine to 20 units per hour, and for a small machine to 2 units per hour. The manager is paid Rs. 4,800 a year, and the workshop supervision occupies half his time which is divided equally among the six machines. Details of other expenses are : Rent and rates of the workshop : Rs. 6,400 a year. Lighting (to be apportioned in the ratio of workers employed) Rs. 1,820 a year. Taking a period of three months as a basis, calculate the macuine hour rate for a large machine and a small machine respectively