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20 Hp unit is required to drive a pump for watering an agricultural farm. Two plans A and B for supplying are under consideration : A B Purchase and installation $10,000 $4,000 Life in years 4 4 Salvage value 1,000 Interest on capital 10% 10% Maintenance per year $3,000 Maintenance per hour - 0.50 Operating wages per hour $0.20 $0.60 Power per hour $1.00 Fuel and oil per hour 2.00 Assuming that 3 million litres of water is to be pumped in a year and that the pump will pump 1,000 litres in an hour, find out the cost per 1,000 litres of water under both the plans and find out the number of hours for which the operating costs of both the machines will be even