A man got a $10\%$ increase in his salary. If his new salary is $Rs.$ $1,54,000$. find his original salary.

The correct option is A ($Rs.140000$)

Let the salary before the increment be $Rs.100$
Increase in salary $=Rs.10$

$\therefore$ Increased salary $=Rs.(100+10)=Rs.110$

If increased salary is $Rs.110$, original salary $=Rs.100$

If increased salary is $Rs.154000$, original salary $=Rs.\left(\frac{100}{110}\times 154000\right)$
$=10\times 14000$
$=Rs.1,40,000$

Hence, the salary of the man before increment was $Rs.1,40,000$.