The selling price of 20 books is equal to the cost price of 5 books. Find the loss or gain percentage.

Correct option is D

Given:

Selling price of 20 books = Cost price of 5 books

Find gain or loss percentage.

Formula Used:

Loss % = $$\frac{\text{CP}-\text{SP} }{\text{CP}} \times 100$$​​

Solution:

20 SP = 5 CP 

​$$\frac{SP}{CP} = \frac{5}{20} = \frac{1}{4}$$ 

SP = 1unit, CP = 4 unit 

Loss% =$$\frac{4 - 1}{4} \times 100$$ = 75%