tolong nomer 15 yaa plisss pakai caranya

W = P × n × t

W1 = 15 × 4 × 12 = 720 Wh
W2 = 30 × 3 × 5 = 450 Wh
W3 = 340 × 1 × 1 = 340 Wh
W4 = 250 × 1 × 2 = 500 Wh
W5 = 80 × 2 × 5 = 800 Wh
Wtot = 800 + 500 + 340 + 450 + 720 =
2.810 Wh ≈ 2,81 Kwh
2,81 × 30 = 84,3 Kwh
84,3 × 1.500 = Rp. 126.450