Question

Calculate the electricity bill amount for a month of $30$ days, if the following devices are used as specified :

$\left(i\right)$. $2$ Bulbs of $40\text{W}$ for $6\text{h/day}$

$\left(ii\right)$. $2$ Tube lights of $50\text{W}$ for $8\text{h/day}$

$\left(iii\right)$. $1$ TV of $120\text{W}$ for $6\text{h/day}$

Given, the cost of electricity is $\text{Rs.}2.5/\text{unit}$.

• A. $\text{Rs.}200$
• B. $\text{Rs.}300$
• C. $\text{Rs.}150$
• D. $\text{Rs.}250$

Answer 1

The correct option is C $\text{Rs.}150$

Total energy consumed,

$E=2\times \frac{40}{1000}\times 6\times 30+2\times \frac{50}{1000}\times 8\times 30+1\times \frac{120}{1000}\times 6\times 30$

$\Rightarrow E=60\text{kWh}=60\text{unit}[\because 1\text{kWh}=1\text{unit}]$

Given, the cost of electricity is $\text{Rs.}2.5/\text{unit}$.

So, total cost will be,

$\text{Rs.}60\times 2.5=\text{Rs.}150$

Hence, option $\left(C\right)$ is the correct answer.