Question

If the cost price of 10 notebooks is equal to the selling price of 9 notebooks .find the gain percent for shopkeeper.

Answer 1

Answer:

Gain % = $\frac{10-9}{9}$ * 100

            = $\frac{100}{9}$ %              

Answer 2

let CP of 1 notebook be Rs. 1
CP of 10 notebooks = SP of 9 notebooks
CP of 9 notebooks = Rs. 9
SP of 9 notebooks = CP of 10 notebooks = Rs. 10

Profit = 10-9 = Rs. 1
Profit % = P/CP × 100 = 1/9 × 100 = 11.11%