List the price of a bike 15% more than it's cost price. It is sold at a discount of 20%. Find the dealer's loss or profit percentage.

Loss 8%

Let the cost price of the bike = 100

List at = 15% more 

So the listed price of the bike = 115

Discount = 20%

Then the selling price of the bike = 80% of 115 = 92

Loss% = ( 100 - 92) × \(\frac{100}{100}\) = 8%