A vendor bought bananas at 6 for a rupee. How many for a rupee must he sell to gain 20%?  Choices: A) 2 B) 4 C) 7 D) 5 E) 3
CP of 6 bananas = 1   Gain = 20%   SP of 6 bananas=1×120/100=12/10   ⇒The number of bananas he should sell for Rs.1 for a gain of 20%=10/12∗6=10/2= 
<gadget id="calculator">10/2</gadget>
<output>5</output>
5   ANSWER:5
<result>D</result>
A vendor bought bananas at 6 for a rupee. How many for a rupee must he sell to gain 20%?