The cost price 15 articles is equal to the selling price of 20 articles. Find the loss percentage.

25%

Cost price of 15 articles = Selling price of 20 articles

Assume cost price of 1 article be 'x'

cost price of 15 article = 15x

Cost price of 20 articles = 20x

But, originally Selling price of 20 articles = 15x

Loss = Cost price of 20 articles-Selling price of 20 articles = 20x-15x = 5x

Loss% = Loss×100/Cost price of 20 articles = 5x × 100/20x = 25%

The correct answer is Option (4) → 25%