Let the marked price be ₹100 (for easy calculation).
Case 1: Single discount of 40%
Discount=40
Selling Price=100−40=60
Case 2: Two successive discounts of 25% and 15%
First discount:
25
Price after first discount:
100−25=75
Second discount:
15
Total discount:
25+11.25=36.25
Difference between the discounts:
40−36.25=3.75
The difference between both discounts is 3.75%.