By selling 15 pencils for a rupee a man loses 20%. How many for a rupee should he sell in order to gain 20%? Answers:
A) 8
B) 7
C) 6
D) 4
E) 10
80% --- 15   120% --- ?     80/120 * 15= 
<gadget id="calculator">  80/120 * 15</gadget>
<output>10</output>
10   Answer:10
<result>E</result>
By selling 15 pencils for a rupee a man loses 20%. How many for a rupee should he sell in order to gain 20%?