By selling 16 pencils for a rupee a man loses 28%. How many for a rupee should he sell in order to gain 28%?  Select.
A) 8
B) 9
C) 7
D) 6
E) 4
72% --- 16   128% --- ?     72/128 * 16= 
<gadget id="calculator">  72/128 * 16</gadget>
<output>9</output>
9   Answer: 9
<result>B</result>
By selling 16 pencils for a rupee a man loses 28%. How many for a rupee should he sell in order to gain 28%?