
To gain 8% after allowing a discount of 10%, by what percent cost price should be hiked in the list price ?

 9%
 11%
 18%
 20%
Correct Option: D
Let the cost price be ₹ 100 and marked price be p.
∴  = 108  
100 
⇒  = 108  
10 
⇒ p =  = 120  
9 
Required Percent = 20%
2nd method to solve this question.
Here, Gain % = 8%,, r_{1} = 10%, r = ?
Gain % =  − r_{1}  
100 
8 =  − 10  
100 
8 =  − 10  
9 
18 =  = 20%  
9 