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kW killo watt hour %E0%A4%98%E0%A4%B0 %E0%A4%AE%E0%A5%87%E0%A4%82 %E0%A4%AC%E0%A4%BF%E0%A4%9C%E0%A4%B2%E0%A5%80 calculation for electricity bill