An electric refrigerator rated 400 W operates for 8 hours per day. What is the cost of the energy to operate it for 30 days at Rs.3.00 per kWh?

An electric refrigerator rated

$400 W$ operates for

$8 hours$ per day. The cost of the energy to operate it for

$30 days$ at

$Rs . 3.00 per kWh$ will be

$Rs . 288 .$
It is given that the electric power of the refrigerator

$= 400 Watt$ ,
The time for which it is used on a daily basis

$= 8 hrs$ ,
The number of days for which it operates

$= 30 days$ .
Thus, from the formula of electric energy consumed,

$Energy = Power \times time \times days$

$\Rightarrow Energy = 400 \times 8 \times 30$

$\Rightarrow Energy = 96000 Wh$
Hence, the total energy consumed after

$30 days$ is

$96 kWh$ .
It is given, cost

$per kWh$ is

$Rs . 3.00$ ,
Therefore, the total cost after

$30 days$ will be

$= 96 \times 3$

$= Rs . 288$

An electric refrigerator rated $400 W$ operates for $8 hours$ per day. What is the cost of the energy to operate it for $30 days$ at $Rs . 3.00 per kWh$ ?