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?
Options:	A) 10%	B) 15%	C) 20%	D) 25%	E) 50%
Let the original salary be $100   new salary = $80   increase on 80 = 20   increase on 100 = [(20/80)100]% = 25%   Answer is 25%
<result>D</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?