Question

A vendor bought toffees at 6 for a rupee. how many for a rupee must he sell to gain 20%? 3

Answer 1

C.P of 6 toffee = 1 Re.
C.P of 1 toffee = 1/6 Rs.

Gain = 20%
S.P = C.P*(100+P)/100 = 1/6 * 120/100 = 0.2 Rs.

0.2 Rs=== 1 toffee
1 Rs===== X toffees
X = 1/0.2 = 5 toffees
He should sell 5 toffees for a rupee to gain 20%

Hope this helps