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= 500 wh = 0,5 kWh . 30
= 15 kwh
jadi, biaya sebulan = 15 kwh x Rp 90 = Rp 1250
~5 buah lampu masing" 10 watt dinyalakan dalam 10 jam perhari
~harga sewa listrik 90,00 tiap kWh
Ditanya : biaya dalam 1 bulan ?
jawab ;
5 x 10 x ( 10 jam x 30 hari ) = 15.000 x 90,00
= 1.350.000