If an electricity bill is paid before due date, one gets a reduction of 4% on the amount of the bill. By paying the bill before due date a person got a reduction of Rs. 13. The amount of his electricity bill was = ?

Solution(By Examveda Team)

Let the amount of bill = Rs. x
According to the question,
$$\eqalign{ & \Rightarrow \frac{{4x}}{{100}} = 13 \cr & x = \frac{{13 \times 100}}{4} \cr & x = {\text{Rs}}{\text{. 325}} \cr} $$

Alternate :
Let the amount of bill = 100 units
4% of 100 units = 4 units
$$\eqalign{ & \therefore \,{\text{ 4 units}} = {\text{ 13}} \cr & \Rightarrow \,{\text{1 unit}} = \frac{{13}}{4} \cr & \Rightarrow 100\,{\text{units = }}\frac{{13}}{4} \times 100 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{. 325}} \cr} $$