A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 20%?
3
4
5
6
Explanation:
C.P. of 6 toffees = Re. 1
S.P. of 6 toffees = 120% of Re. 1 = Rs.$ \dfrac{6}{5} $
For Rs.$ \dfrac{6}{5} $, toffees sold = 6.
For Re. 1, toffees sold =$ \left(6 \times\dfrac{5}{6} \right) $= 5.