Profit and Loss - General Questions

A man sold an article for Rs. 944 at a loss of 20%. What was the cost price?

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

An article bought for Rs. 580 is sold for Rs. 652.5. What is the gain percent?

The cost price of 20 articles is equal to the selling price of 15 articles. What is the gain percent?

A man sells two articles at the same price. On one he gains 10% and on the other he loses 10%. What is his overall gain or loss percent?