A bookseller sells a book for Rs. 100, gaining Rs. 20. His gain per cent is

Rajan buys a toy for Rs. 75 and sells it for Rs. 100. His gain per cent is

A bat is bought for Rs. 120 and sold for Rs.105. The loss per cent is

On selling an article for Rs.48, a shopkeeper loses 20%. In order to gain 20%, what would be the selling price?

On selling an article at a certain price a man gains 10%. On selling the same article at double the price, gain per cent is