Rohan bought a mobile phone with a 25% discount on the labeled price. Had he bought it with a 30% discount, he would have earned Rs. 500. At what price did he buy it? 

7500

30% - 25% = 5%   

(difference in discount)                                                    

5% = 500 (given)                    

Then, 1% = 100

⇒75% = 7500