By selling an article for $90, a person gains $15. What is the gain %? Select the correct option.
A) 25%  B) 30%  C) 50%  D) 20%  E) 10%
S.P. = $90   Gain = $15   C.P. = 90-15= 
<gadget id="calculator">90-15</gadget>
<output>75</output>
75   Gain%= 15/75 * 100= 
<gadget id="calculator">15/75 * 100</gadget>
<output>20</output>
20%   Answer is 20%
<result>D</result>
By selling an article for $90, a person gains $15. What is the gain %?