Question:
A dealer allows his customer a discount of 25% and still gains 25%. If cost price of a radio is Rs. 1,440, its marked price is:

Option A):
Rs. 2440
Option B):
Rs. 2400
Option C):
Rs. 2500
Option D):
Rs. 2020

Correct Answer is Option B):
Rs. 2400

Explanation:
Let the marked price = Rs. x.
Hence,
75*x/100 = 1440* (125/100);
→x = (1440*125)/75 = Rs. 2400.