Dear Sir,
There are two issues in your question :
a) Computation of Capital Gain
First of all only capital gain amount is taxable and not total sale proceeds so it is important to note cost of property and date of purchase of property. Based on that gain amount can be derived. If the property is purchased before 01/04/1981 than valuation report as on 01/04/1981 is required to be taken.
b) Tax Working & Investment Working
Secondly whatever capital gain is there you can get upto Rs. 50 Lacs in bond balance amount you need to invest in another house property within next 2 years. Till the time you invest such amount you need to park the same in Capital Gain Account Scheme and it can used only for the purpose of payment. If you do not invest or park this amount in Capital Gain scheme this amount on or before 31st July,17 i.e. return filing due date than such amount shall be subject to tax.
So total amount subject to tax can be
Sale Value - Index cost of Value - Investment in Bond - Amount not invested in new property
For any query you can surely contact me back. I can make correct Capital Gain working and let you know the tax position and amount of investment required along with the period in which you can do investment.