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An electric bulb of $60 W$ burns for $5$ hours a day. The cost of electricity in a month of $30$ days at $3 Rs$ per unit is

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270

27

2.70

2700

answer is B.

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Detailed Solution

The cost of electricity involved in a month of

30

days at

3 Rs

per unit is

27

Given:
Power

= 60 Watt

Everyday Use

= 5 Hours

Total Days

= 30

Cost Of electricity per unit

= 3.00 Rs .

Total amount to be paid in

30 days

The days can be calculated in total hours used in

30 days

Hence,

total hours = Days \times Everyday Use

\Rightarrow

= 30 \times 5 = 150 Hours

Convert,

60 Watt

into Kilowatt

= \frac{60}{1000}

By Formula,

Unit = Kilowatt \times Time (in hours)

U = \frac{60}{1000} \times 150

U = 9

Hence, the total unit used is

9

.
By Formula,

Cost = Unit \times Rupees per unit

Cost = 9 \times 3.00

Cost = 27 Rupees

Therefore, the amount to pay in

30 days

27

Rupees.

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