A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 30%?
Select the correct option:  A) 1/2  B) 2/6  C) 3/6  D) 9/6  E) 15/2
C.P. of 6 toffees = Re. 1   S.P. of 6 toffees = 180% of Re. 1 = Rs. 9/5   For Rs. 9/5 , toffees sold = 6.   For Re. 1, toffees sold = 9 x 5 /6 =15/2.   Answer 15/2
<result>E</result>
A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 30%?