By selling two articles for Rs. 800, a person gains the cost price of three articles. The profit percent is:

Answer: Option D

Selling price of 2 → 800
                        1 → 400
Let cost price of one article = x
Gain at 2 articles = 3x
            1 article = $$\frac{3\text{x}}{2}$$
Selling price = x + $$\frac{3\text{x}}{2}=\frac{5\text{x}}{2}$$

Profit % = $$\frac{3}{2}$$ × 100 = 150%