1. The problem states that a shopkeeper bought an article for 400 and sold it for 480. We need to find the profit percentage. 2. First, calculate the profit by subtracting the cost price from the selling price: $$\text{Profit} = \text{Selling Price} - \text{Cost Price} = 480 - 400 = 80$$ 3. Next, calculate the profit percentage using the formula: $$\text{Profit \%} = \left(\frac{\text{Profit}}{\text{Cost Price}}\right) \times 100 = \left(\frac{80}{400}\right) \times 100$$ 4. Simplify the fraction and calculate: $$\frac{80}{400} = 0.2$$ $$0.2 \times 100 = 20$$ 5. Therefore, the profit percentage is 20%.