What will be the cost of acquisition

Hello freinds.

Kindly tell me that what will be the Cost of Acquisition in case of property, which is purchased in installment?

A property is booked with a builder when construction was going on. Several payments were made in installments which were as under:

1999          33568   Booking done

2000          50352

2001          41960

2002          41960

2002          84547

2003          41960

2003          125880  

2003           43764   Possesion granted

Penalty payments

2008      2655

2009      550

2010      2140

No registration till now.

Asset to be sold in 2010 after registration. There will be some registration and stamp duty charges.

My question is :

1. What will be the cost of acquisition in this case? or Method of calculation of COA?

2. Should we take indexation? if yes, from which year?

3. Is there any improvement involved?

4. Will it be treated as transfer of right or actual transfer?

5. Any other issue involved in your opinion?