By selling an article for $100 a man gains $20 then his gain%?
Choose one:
A) 25%	B) 30%	C) 50%	D) 20%	E) 10%
S.P. = $100   Gain = $20   C.P. = 100-20= 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80   Gain%= 20/80 * 100= 
<gadget id="calculator">20/80 * 100</gadget>
<output>25</output>
25%   25%nswer is 25%
<result>A</result>
By selling an article for $100 a man gains $20 then his gain%?