A person purchased a portion in a building in 1974 for Rs. 72,000/- .After 2 years he started constrcuting more floors in that building upto 4th floor jointly with his brothers but he got specific share in the constructed property. Out of 4800 sft constructed jointly with his brothers, he got 2000 sft. This 2000 sft along with earlier thing purchased by him in 1974 for rs. 72000/- has been sold in FY 2012-13 for 46 lakhs.
How to calculate capital gains tax involved in it????