Profit and Loss - General Questions

A man sold an article for Rs. 288 at a loss of 20%. What was the cost price?

A man sells two articles at the same price. On one he gains 12% and on the other he loses 12%. What is his overall gain or loss percent?

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

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

A man sold an article for Rs. 352 at a loss of 20%. What was the cost price?