By selling an article for $180, a person gains $30. What is the gain %?
Choose the correct option
A) 25%	B) 30%	C) 50%	D) 20%	E) 10%
S.P. = $180   Gain = $30   C.P. = 180-30= 
<gadget id="calculator">180-30</gadget>
<output>150</output>
150   Gain%= 30/150 * 100= 
<gadget id="calculator">30/150 * 100</gadget>
<output>20</output>
20%   Answer is 20%
<result>D</result>
By selling an article for $180, a person gains $30. What is the gain %?