Utility charges calculations

Two farmers uses two different electric motors to pump water. These motors need to consume 500 kWh to pump enough water. Motor #1 and #2 has a rated power of 5kW and 50kW, respectively. a) How long would they need to work to pump enough water? b) If the energy and demand charges are $0.15/kWh and $7/kW, calculate the final utility charges for these two motors. c) If farmer #2 decides to run the motor during the off-peak hours, where the demand charges are $5/kW, how much money can be saved?
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