Capital gain

Land acquired under Delhi Development Authority Housing Scheme. Year Particular Amount 1981-82 Application Money 5,000 2004-05 1st Installment 3,35,342 2010-11 2nd Installment 61,479 2012-13 Sale Value 29,00,000 From when Date of Acquisition sould be calculated? *Tax Calculation? *Rate of taxation to be taken 10% or 20%? *Method of Saving Tax Note: 1)Above land was owned jointly in name of X and Y. 2)They currently have another house in their name. 3)They have currently acquiring another house (construction is going on) of whish application money was paid in April from co-owner's (X) account. So whether this money can be treated as investment for exemption under section 54F. 4)All the payments for above land was made from pramod account. 5)Sale proceeds has been credited to Y A/c.