Profit and Loss - General Questions

An article bought for Rs. 680 is sold for Rs. 952. What is the gain percent?

The cost price of 31 articles is equal to the selling price of 23 articles. What is the gain percent?

A shopkeeper marks his goods 40% above the cost price and allows a discount of 10%. What is his gain percent?

A man sold an article for Rs. 1,110 at a loss of 25%. What was the cost price?

A dishonest dealer professes to sell his goods at cost price but uses a weight of 950 g for a kilogram. What is his gain percent?