Please help about rate of CDT for A.Y 2011-12

The current CDT is 18 % (Edu cess @ 3% extra).

Please refer Section 115-O.

CDT is 16.60875%

15% CDT, 7.5% Surcharge, 3% edu cess

worked out as under

15% + 7.5% of 15%

=15 + 1.125 =16.125

add edu cess 3%

16.125 + 3% of 16.125

16.125 + .48375 = 16.60875

Yeah! Agreed with Vivek.

@ Prabeer : Please note that it is MAT which is 18% tax rate. CDT is @ 15% 

@ Vivek & Heba: Can u pls provide me with the section from the I.T. Act ..?

section is same as u mentioned 115-O(1) 

I'm sorry I was worng.