The marked price of an article is ₹840. A shopkeeper gives a discount of 15% on the marked price and still makes a profit of 19%. What is the cost price of the article?
A bought a bag and a bottle for a total on ₹900. He sold the bottle at a profit of 12% and the bag at a profit of 20%. If he earned a total profit of ₹160.80, then calculate the cost price of the bottle.
The following table shows the number of tables and the number of chairs made of 5 different metals sold by a furniture store over a given time period
| Metal | Tables | Chairs |
| M1 | 100 | 50 |
| M2 | 150 | 70 |
| M3 | 120 | 40 |
| M4 | 125 | 25 |
| M5 | 200 | 60 |
N = Average number of chairs sold per metal
The number of tables sold that were made of metal M3 is approximately what percentage more than N?
A goldsmith uses 110 cm³ of gold to make a wire 1 mm in diameter. He will use this wire to make gold chains of equal lengths. If each chain requires 56 cm length of wire, then how many gold chains can he make?\(\text{(Use }\pi = \tfrac{22}{7}\text{)}\)