Question

If cost price of 25 books is equal to selling price of 20 books, calculate the gain on loss percent?

Answer 1

We are given:

Cost price of 25 books = Selling price of 20 books

Now, we know

Selling price = Cost price + Profit

Cost price of 25 books = Cost price of 20 books + Profit on 20 books

$\Rightarrow$ Cost price of 25 books - Cost price of 20 books = Profit on 20 books

$\Rightarrow$ Profit on 20 books = Cost price of 25 books - Cost price of 20 books

$\Rightarrow$ Profit on 20 books = Cost price of 5 books

Thus, profit percentage = $\frac{\mathrm{Cost}\mathrm{price}\mathrm{of}5\mathrm{books}}{\mathrm{Cost}\mathrm{price}\mathrm{of}25\mathrm{books}}\times 100=\frac{5}{25}\times 100=5\times 4=20\%$