A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 20%?

A. 3
B. 4
C. 5
D. 6

Explanation: C.P. of 6 toffees = Re. 1 S.P. of 6 toffees = 120% of Re. 1 = Rs. 6/5 For Rs. 6/6 , toffees sold = 6. For Re. 1, toffees sold = 6 * 5/6 = 5

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