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In a house, $5$ bulbs of $25 W$ each are used for $6$ hours in a day. Calculate the total expenditure for electricity consumed in $30$ days if $1$ unit of electricity costs $Rs 1.5$ .

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Rs 337.5

Rs 3.375

Rs 33.75

Rs 3375

answer is C.

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Detailed Solution

In a house,

5

bulbs of

25 W

each are used for

6

hours in a day. The total expenditure for electricity consumed in

30

days if

1

unit of electricity costs

Rs 1.5

Rs . 33.75 .

Given:
Power of

1

bulb =

25 W

Power of

5

bulbs =

5 \times 25 W

\Rightarrow = 125 W

\Rightarrow = 0.125 kW

Time =

6 \times 30 h

\Rightarrow

= 180 h

Energy = Power \times Time

\Rightarrow E = 0.125 kW \times 180 h

\Rightarrow

E = 22.5 units

Cost of

1

unit

= Rs 1.5

Cost of

22.5

units

= 22.5 \times 1.5

\Rightarrow

Total cost

= Rs 33.75

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