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17.02.2022, solved by verified expert

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Initially there were 10 bulbs of 60 Watt power

So total power of all bulbs = 60 * 10 = 600 W

now each bulb used for 4 hours daily

so total energy consumed daily

now we have total power consumed in 1 year

cost of electricity = 10 cents/ kWh

so total cost of energy for one year

Now if all 60 Watt bulbs are replaced by 30 Watt bulbs

So total power of all bulbs = 30 * 10 = 300 W

now each bulb used for 4 hours daily

so total energy consumed daily

now we have total power consumed in 1 year

cost of electricity = 10 cents/ kWh

so total cost of energy for one year

total money saved in 1 year

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