If a merchant purchases 9 pens and sell 8 pens at the cost price of 9 pens, then his profit percent is :

By selling 8 pens, Shyam loses equal to the cost price of 2 pens. Find his loss percent.

If the selling price of 10 pens is the same as the cost price of 12 pens then gain per cent is

If the cost price of 16 pens is equal to the selling price of 12 pens,then the gain or loss percent is

If the cost price of 6 pens is equal to the selling price of 4 pens,find the profit or loss percent.

If the cost price of 15 pens is equal to the selling price of 20 pens, then the loss percent is (a) 25% (b) 20% (c) 15% (d) 18%

The selling price of 12 pens is equal to the cost price of 14 pens. Find the gain per cent.