an article has a marked price rs.3600.by giving two successive discounts of 10% each instead of 20%on the marked price,the gain of the trader in rupees is?

20% of 3600= 720 marked price after giving discount------3600-720=2880 1st 10% discount 10% of 3600 = 360 marked price after 10% discount------3600-360=3240 2nd 10% discount 10% of 3240=324 marked price after 2nd 10% discount----3240-324=2916 profit------2916-2880=36