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110 V / 220 V = 100 W / x
1/2 = 100 W / x
x = 200 watt
mohon maaf kalo salah
110²/100 = 220²/P2
12100 / 100 = 48400/P2
121 = 48400/P2
P2 = 48400/121
P2 = 400 watt (A)