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Option 1 : 660
Concept: Energy consumed = power consumed × time of operation
Energy consumed in 12 hrs. by factory = 30 × 12 = 360 kWhr
Energy consumed in 12 hrs. by factory = 25 × 12 = 300 kWhr
∴ Total energy consumed by factory in a day = 360 + 300 = 660 kWhr
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