The salary of a person was reduced by 20%. By what percent should his reduced salary be raised so as to bring it at par with his original salary? Select the correct option
A) 50%  B) 32%  C) 25%  D) 43%  E) 29%
Let the original salary be $100   New salary = $80   Increase on 80 = 20   increase on 100 = 20/80 *100= 
<gadget id="calculator">20/80 *100</gadget>
<output>25</output>
25%   Answer is 25%
<result>C</result>
The salary of a person was reduced by 20%. By what percent should his reduced salary be raised so as to bring it at par with his original salary?