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= 8lampu × 15watt × 6jam = 720watt
= 1lampu × 40watt × 6jam = 240watt
= 5lampu × 50watt × 6jam = 1500watt
Total = 2460watt per hari
Per bulan = 2460 × 30
= 73.800watt atau 73,8 kWh
Jadi Biaya Perbulan = 73,8 × 400.000
= Rp 29.520.000
maaf kalau salah.