By selling 18 pencils for a rupee a man loses 20%. How many for a rupee should he sell in order to gain 20%?  Choices:	A) 8	B) 9	C) 7	D) 12	E) 4
80% --- 18   120% --- ?     80/120 * 18= 
<gadget id="calculator">  80/120 * 18</gadget>
<output>12</output>
12   Answer: 12
<result>D</result>
By selling 18 pencils for a rupee a man loses 20%. How many for a rupee should he sell in order to gain 20%?