Question

A shopkeeper bought 12 toffees for one rupee. in order to gain 20% how much toffees should he sells for a rupee

Answer 1

C.P. . of 12 toffees = Rs. 1
$S.P. = ( \frac{100 +Profit \%}{100}) \times C.P. \\ = (\frac{100 + 20}{100} ) \times 1 \\ = \frac{120}{100} \\ = \frac{6}{5}$

For Rs 6/5 , toffees sold =12
For Rs. 1 , toffees sold = 12×5/6=Rs.10

Answer 2

C.P of 12 toffees = Rs 1
S.P = (100 + profit percent/100) C.P
(100 + 20/100) x 1

= 120/100
= 6/5
For Rs 6/5, Toffees sold = 12

For Rs 1, Toffees sold = 12 x 5/6 = Rs. 10.