a 2 kw heater a 200w tv and three 100 w lamps are all switched on from 6pm to 10 pm what is the total cost at rs 5.50 per kwh
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power=2000+300+200=2500w=2.5kw
time=4 hrs
commercial unit=2.5*4=10kwh
time=4 hrs
commercial unit=2.5*4=10kwh
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