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Question

# A washing machine rated 300W is operated one and half an hour/day. If the cost of units is Rs.3.50, find the cost of energy to operate a washing machine for the month of September.

A
Rs.27.90
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B
Rs.35.25
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C
Rs.47.25
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D
Rs.55.90
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Solution

## The correct option is D Rs.47.25Now, the units consumed (kWh) = power (kW) x time (hours)There are 30 days in the month of September, thus 1.5x30 = 45 hoursThus the number of units is given by 300 x 10−3 x 45Total number of units = 13.5 unitsThus the energy cost for 13.5 units is 13.5 x 3.5 =Rs 47.25\$

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