Difference between a discount of 40% on Rs. 500 and two successive discount of 36% and 4% on the same amount is _____ ?

Explanation:

Sale after 40% discount = 60% of Rs. 500 = Rs. 300

Price after 36% discount = 64% of Rs. 500 = Rs. 320

Price after next 4% discount = 96% of Rs. 320 = Rs. 307.20

Difference in two prices = Rs. 7.20