CAT 1994 — QA Question 30

16 articles sold at priced 12 articles, is equivalent to discount of 25% $\left[\left(\frac{16-12}{16}\right]\times 100\right)$

Hence, shop keepers offer two discounts of 20% and 25% respectively and still makes a profit of 20%
If c is the cost price of an article and m is the marked price, then 1.2 × c = m × $\frac{3}{4}\times \frac{4}{5}$

⇒ m = 2c.
This means that he had marked his goods 100% above his cost price.