Question

4 lampu 100 w dan 5 kipas angin 120 w dijalankan slama 8 jm. biaya listriknya jika tariff listrik 1500 rp per kwh adlah....

Answer 1

4 x 100 w = 400 w x 8 = 3200 wh
5 x 120 w = 600 w x 8 = 4800 wh

3200 wh + 4800 wh = 8000 wh = 8 kwh
8 kwh x Rp1500 = Rp120.000

Answer 2

4 x 100 = 400 watt
5 x 120 x 8 = 4800 watt

400 watt + 4800 watt
= 5200 watt
= 5,2 kwh

5,2 x 1500 = 10800