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A 220 V HP motor has efficiency of 80%. If the power cost P3per kwhr for the first 50 kwhr, P2.90 perkwhr for the second

A 220 V HP motor has efficiency of 80%. If the power cost P3per kwhr for the first 50 kwhr, P2.90 perkwhr for the second 50 kwhr , P2.80 for the third kwhr and so on until a minimum of P2.50 per kwhr is reached. How much does it cost to run this motor continuously for 7 days?

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