Capital gain

Hi.

I need your help in following Capital Gain Working  :

1)Flat Purchased in F Y 2005-2006 for Rs 265500/-

2) Above flat sale on 30.04.2011 for Rs 559000/-

3) New Resi. Land ( Resi. Plot ) purchased on 05.09.2011 for Rs 57000/-

As per my calculation Capital Gain is :

1 Full Value of Consideration            Rs 559000/-

Less : Indexed Cost of Acquisition   Rs 419351/-

                                                 Balance Rs  139649/-

Less : Exemption U/s 54                    Rs 57000/-

                                                                ------------------                            

Capital Gain is Rs                                    82649/-

Dear all it is correct or incorrect please reply me..........