1. A shopkeeper bought a chair for Rs 375 and sold it for Rs 400. Find the gain Percentage.
2. Cost of an item is Rs 50. It was sold with a profit of 12%. Find the selling price.
3. An article was sold for Rs 250 with a profit of 5%. What was its cost price?
4. An item was sold for Rs 540 at a loss of 5%. What was its cost price?