Question

He

c.P of 15 books is equal to the s.P of 18 books. Find his gain% or loss%?

Answer 1

$cp \: of \: 15 \: books = sp \: of \: 18 \: books \\ \\ = > cp \times 15 = sp \times 18 \\ \\ = > \frac{cp}{sp} = \frac{18}{15} = \frac{6}{5} \\ \\ sp = 5 \: and \: cp = 6$

As we know that when CP is greater than SP then it will be loss

$loss = 6 - 5 = 1$

Now, loss% :

$\frac{1}{6} \times 100 \\ \\ = > \frac{50}{3} \\ \\ = > 16 \frac{2}{3}$