
A shopkeeper sells his goods at 10% discount on the marked price. What price should he mark on an article that costs him ₹ 900 to gain 10% ?

 ₹ 1275
 ₹ 1250
 ₹ 1175
 ₹ 1100
Correct Option: D
Given that , C.P. of article = ₹ 900
Gain = 10%
∴ S.P. = ₹  × 900  = ₹ 990  
100 
discount = 10%
Let the marked price be y.
∴  y = 990  
100 
∴ y =  = ₹ 1100  
90 
Second method to solve this question :
Here, D = 10%, C.P. = ₹ 900, R = 10%, M.P. = ?
Using the given formula ,
=  
C.P.  100 − D 
=  
900  100 − 10 
M.P. =  × 900  
90 
M.P. = ₹ 1100