Tolong dibantu nomor 25 yah....

Lampu1 = 3 x 20 x 12 = 720
Lampu2 = 3 x 40 x 12 = 1440
Pompa = 250 x 4 = 1000
Setrika = 300 x 2 = 600

30 ( 720 + 1440 + 1000 + 600 ) = 30 x 3760 = 112.800 Wh = 112,8 kWh
Tarif = 1000/kWh,
112,8 x 1000 = Rp 112.800

lampu = 3x20x12x30:1000 =21,6kWh
lampu = 3x40x12x30:1000 =43,2kWh
pompa= 1x250x4x30:1000=30kWh
setrika= 1x300x2x30:1000 =18kWh
jmlh yg harus dibayar = (21,6+43,2+30+18)x1000 =112,8x1000
= Rp 112800