Question

Selling price of 10 book equals to the cost price of 8 books.find gain or loss percentage

Answer 1

Answer:

20%

Step-by-step explanation:

selling price of 10 book equals to the cost price of 8 books then

SP × 10 = CP × 12

$\frac{sp}{cp} = \frac{12}{10} = \frac{6}{5}$

so the ratio of SP:CP = 6:5 so let SP be 6x and CP be 5x so

P% = SP-CP/CP × 100

$= \frac{6x - 5x}{5x} \times 100$

$\frac{x}{5x} \times 100$

= 20%