A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 25%?  Choose the correct choice:
A) 2
B) 9
C) 6
D) 3
E) 5
C.P. of 6 toffees = Re. 1   S.P. of 6 toffees = 150% of Re. 1 = Rs. 3/2   For Rs. 3/2 , toffees sold = 6.   For Re. 1, toffees sold = 6 x3/2 = 9.   Answer 9
<result>B</result>
A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 25%?