21 articles were bought for ₹ 6531 and sold for ₹9954. How much was the approximate profit percentage per article?

If some articles are bought at Rs 16 each and sold at Rs 18 each, then what is the profit percentage?

An article bought for ₹ 400 is sold for ₹ 448. What is the profit per cent?

Some articles were bought at 6 for Rs. 5, and sold at 5 for Rs. 6. Gain per cent is

An article was bought for ₹400 and sold for ₹336. find the loss and loss per cent.

Quantity I: Profit Percentage, if Some articles were bougth at 6 articles for Rs.5 and sold at 5 articles for Rs. 6. Quantity II: Profit Percentage, if 100 toys are bougth at the rate of Rs. 350 and sold at the rate of Rs. 48 per dozen.

Solve any four sub questions from the following : An article bought for ₹ 400 is sold for ₹ 448. What is the profit per cent?

Three articles are bought at Rs400 each. One of them is sold at a loss of 10%. If the other two articles are sold so as to gain 20% on the whole transaction, then what is the gain percentage on the two articles?