Question

the selling price of 18 books is equal to the cost price of 21 books.find the gain or loss percent
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Answer 1

Answer:

s.p= 18

c.p=21

profit 3 books

3/21 *100= 14 2/7

Answer 2

Answer:

$\frac{6825}{2} \% \: profit$

Step-by-step explanation:

Consider the selling price of 18 books = 100then cost price of 21 books = 100Cost price of 18 books =

$\frac{100 \times 8}{21} = \frac{800}{21}$

There will be profit or gain because

$100 > \frac{800}{21}$

Profit = 1300

Profit% =

$\frac{1300}{( \frac{800}{21}) } \times 100 = 1300 \times 100 \times \frac{21}{800} =$

$\frac{6825}{2} \%$