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Verified answer
Diket :P = ( 4 . 50 ) + ( 2 . 100) = 400 watt
t = 8 jam / hr
tarif = Rp 720 / kwh
dit : biaya 1bln (30 hr)
jwb :
#total energi 1 bln
W = P . t . 30
W = 400 . 8 . 30
W = 96.000 wh = 96 kwh
# biaya
biaya = W . tarif
biaya = 96 . 720
biaya = Rp 69.120