It's a cost accounting question

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Power expenses (Including 15% surcharge) is Rs. 5,750. Power consumption per hour is 10 units and rate per unit is Rs. 2. Compute machine hours. What would be the cost of direct laour, if the prime cost, conversion costs and total factory costs were Rs. 1,55,000, rs. 3,25,000 and Rs. 4,10,000 respectively