Problem 15 The following particulars refer to process used in the treat- ment of a material subsequently incorporated in a component for. ming part of an electrical appliance : (a) The original cost of the machine used (purchased in June 1978) was Rs. 10,000. Its estimated life is 10 years, the estimated scrap, value at the end of its life is Rs. 1,000, and the estimated working time per year (50 weeks of 44 hours) is 2,200 hours of which machine maintenance, etc. is estimated to take up 200 hours. No oluer loss of working time expected, setting up time, esti- mated at 5% of total productive time is regarded as productive time. (Bank hol are to be ignored). (b) Electricity used by the machine during production is 16 units per hour at a cost of 9 P. per unit, No current is taken during maintenance or setting up. (c) The machine requires a chemical solution which is repla. ced at the end of each week at a cost of Rs. 20 each time. (d) The estimated cost of maintenance per year is Rs. 1,200. (e) Two attendants control the operation of the machine together with five other identical machines. Their combined weekly wages, insurance, and the employer's contributions to holiday pay amount to Rs. 120. (1) Departmental and general works overheads allocated to this machine for the year 1978-79 amount to Rs. 2,000. You are required to calculate the machine-hour rate necessary to provide for recoupment of the costs of operating the machine