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Pemanas air = 120 × 2,5 × 40(60) = 300 × 2400 = 720000 J
Kipas angin = 120 × 2 × 30(60) = 240 × 1800 = 432000 J
Lampu = 120 × 1,25 × 20(60) = 150 × 1200 = 180000 J
Jumlah = 720000 + 432000 + 180000 = 1332000 J