Question 28

A 100 watt bulb is burnt everyday for 15 hours. What will be the cost of consumption in 30 days at the rate of 50 paise/unit?

Solution

the total energy consumed in 30 days=100×15×30=45000 W

unit of electricity is calculated in kW.

∴total energy consumed=45 kW

the total cost of consumption= total energy consumed ×rate per unit=45×.5= Rs. 22.5

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