15 articles are sold at the total cost price of 20 articles. The gain or loss per cent is:

Correct option is A

Given:

Cost Price of 20 identical items = Selling Price of 15 items

Formula Used:

Profit Percent $$= \frac{Profit}{CP} \times 100$$​​

Solution:

According to question:

20CP = 15SP

​$$\frac{CP}{SP} = \frac{15}{20}$$​​

If CP = 15 then SP = 20

Then profit = 20-15 = 5

Profit Percent =$$\frac{5}{15} \times 100 = \frac{100}{3}\% = 33\frac{1}{3}\% Gain$$​​