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Answer» the answer:
Energy consumed by ELECTRIC BULB = power of the bulb ⨯ Time
Energy consumed by electric bulb of 100 w = 100 w ⨯ 30 ⨯ 2 hrs
Energy consumed by electric bulb of 100 w = 3000 watt-Hour
Energy consumed by electric bulb of 100 w = 3 kilo watt-Hour
Energy consumed by four BULBS each of 40 w = Number of the bulbs ⨯ power of each bulb ⨯ Time
Energy consumed by four bulbs each of 40 w = 4 ⨯ 40 w ⨯ 4 hrs ⨯30
Energy consumed by four bulbs each of 40 w = 19200 watt - Hour
Energy consumed by four bulbs each of 40 w = 19.2 kilowatt – Hour
Total energy consumed = Energy consumed by electric bulb of 100 w + Energy consumed by four bulbs each of 40 w
Total energy consumed = 3 kilo watt-Hour + 19.2 kilowatt – Hour
Total energy consumed = 22.2 kilo watt-Hour
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