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

Ramesh bought two boxes for Rs 1300. He sold one box at a profit of 20% and the other box at a loss of 12%. If the selling price of both boxes is the same, find the cost price of each box.

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

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