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Rumusnya adalah
W = V x A
lampu = 5 A
pompa air = 10 A
setrika = 2 A
V = 220 Volt
lampu = 5 x 220 = 1.100 Watt
pompa air = 10 x 220 = 2.200 Watt
setrika = 2 x 220 = 440 Watt
Penyelesaian :
lampu = 1.100 x 12 = 13.200
pompa air = 2.200 x 4 = 8.800
setrika = 440 x 2 = 880
* 13.200 + 8.800 + 880 = 22.880 W/hari = 22,88 kWh/hari
* 22,88 x Rp 20.000,00 x 30 = Rp 13.728.000,00
Semoga membantu, semangat belajar... ^_^