No 12 :v Makasih^^ .....

E 2 lampu = 2(20 W)(10 h) = 400 Wh = 0,4 kWh
E solder = (220 W)(5 h) = 1100 Wh = 1,1 kWh
E tv = (40 W)(6 h) = 240 Wh = 0,24 kWh
ΣE = 1,74 kWh

E 30 hari = (1,74 kWh)(30) = 52,20 kWh
Jawaban: B.