caranya bagaimana ya?

4x20x4=320 Wh
2x60x4=480 Wh
1x60x4= 240 Wh
____________ +
1.040 Wh→1,04 kWh
→=1,04 kWh x 30 hari = 31,2 kWh
→31,2 kWh x Rp.150 =Rp 4.680