A vendor bought bananas at 6 for Rs.10 and sold them at Rs.4 for Rs.6 .Find his gain or loss percent . Choose the correct choice from the following answers:
A) 10
B) 20
C) 25
D) 30
E) 32
Sol:   Suppose , number of bananas bought = LCM of 6 and 4=12   CP=Rs.[(10/6)*12]=Rs.20 ; SP= Rs[(6/4)*12]=Rs.18   Loss%=[(2/20)*100= 
<gadget id="calculator">(2/20)*100</gadget>
<output>10</output>
10%   Option 10
<result>A</result>
A vendor bought bananas at 6 for Rs.10 and sold them at Rs.4 for Rs.6 .Find his gain or loss percent .