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Question

# A washing machine rated 300 W is operated one and half hour/day. If the cost of unit of power is Rs.3.50, find the cost of operating a washing machine for the month of september

A
₹ 27.90
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B
₹ 35.25
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C
₹ 47.25
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D
₹ 55.90
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Solution

## The correct option is C ₹ 47.25Energy consumed by the washing machine (Per day)=P×t=3001000×32=920 kWh A unit of power for homes is calculated in terms of kWh, therefore Total energy consumed by the washing machine for the month of september =920×30=272 kWhCost=272×3.50=47.25Cost=47.25

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