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6 tubes light of 40w each and 4 fans of 100w each operate on an average 10 hours a day. if the energy cost rs 3 per unit, calculate the monthly bill. |
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Answer» Explanation: 1unit=1kw/h POWER= (6×40)+(4×100) P=640 watt power in ONE DAY = 10×640 = 6.4kw*h rs for one day = 3×6.4= 19.2 for MONTH = 19.2×30 = 576 |
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