tolong dgn caranya yaa please . bagi yg ga bisa gausa jawab

Nomor 20
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JAWABAN : C

Diketahui :
Nama alat → Daya, P → Lama pemakaian (Jam/Hari) →Energi (kWh/30 hari)
Gunakan Rumus :

W = N x P x t x 30 hari

Dimana : 
N = jumlah alat
P = daya
t = waktu pemakaian

# Alat Lampu
 W = N x P x t x 30 hari
36 kWh = N. [20 Watt] x [12 Hours] x 30
36 kWh = N x 7200 Wh
36 kWh = N x 7,2 kWh
N = 36/7,2
N = 5 Lampu

# Alat Kipas Angin
 W = N x P x t x 30 hari
15 kWh = N. [25 Watt] x [10 Hours] x 30
15 kWh = N x 7500 Wh
15 kWh = N x 7,5 kWh
N = 15/7,5
N = 2 Kipas Angin

# Alat TV
 W = N x P x t x 30 hari
36 kWh = N. [100 Watt] x [15 Hours] x 30
90 kWh = N x 45000 Wh
90 kWh = N x 45 kWh
N = 90/45
N = 2 TV

# Alat AC
 W = N x P x t x 30 hari
360 kWh = N. [500 Watt] x [8 Hours] x 30
360 kWh = N x 120000 Wh
360 kWh = N x 120 kWh
N = 360/120
N = 3 AC

Jadi Banyaknya alat adalah :
5 Lampu
2 Kipas Angin
2 Kipas Angin
3 AC