It's a cost accounting question

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Deep completes a work in 7 hours instead of 10 hours. Labour rate per hour Rs. 20. What he will earn as per Rowan plan? Original cost of machine Rs. 5,50,000, Present replacement cost of machine Rs. 5,10,000, Book value of machine Rs. 3,20,000, Installation charges Rs. 20,000, Estimated scrape value at the end of useful life of 10 years Rs. 10,000. Calculate depreciation of machine