Question

The salary of an employee is increased by $15$%. If his new salary is $Rs.12,650$, what was his salary before enhancement?

Answer 1

Let the salary before enhancement be $Rs.100$. Since his increment is $15$%, his salary after enhancement is $Rs.100+Rs.15=Rs.115$.
Now we reverse the role. If the new salary is $Rs.115$, salary before enhancement is $Rs.100$.
If the new salary is $Rs.12,650$, salary before enhancement is $\frac{100}{115}\times 12650=Rs.11,000$.
Therefore, his salary before enhancement is $Rs.11,000$.