If the selling price of 18 oranges is equal to the cost price of 16 oranges, find the loss percent.

If theselling price of 10 pens is equal to cost price of 14 pens, find the gain percent.

If the selling price of 18 chairs be equal to selling price of 16 chairs, find the gain or loss percent.

Ravish sold his motorcycle to Vineet at a loss of 28%. Vineet spent Rs 1680 on its repairs and sold the motor cycle to Rahul for Rs 35910, thereby making a profit of 12.5%, find the cost price of the motor cycle for Ravish.

By selling a book for Rs 258, a bookseller gains 20%. For how much should he sell it to gain 30%?