How much tax I should pay??

If you invest the money immediately in capital gain schemes you will get exemption.  To claculate the tax information given by you is not sufficient.

read the below thread to understand and calculate your Capital Gains liability

https://www.lawyersclubindia.com/forum/Re-Tax-Treatment-39191.asp

once you get the amount of capital gain using the details in link above you will need to invest only the amount you arrived as above in a approved scheme within the specified time and your tax would be saved.

Details you provided is not suffic, still rply to your query will be as below:-

Hope you have understood...

YOUR CASE COMES UNDER THE PERVIEW OF SECTION 54F OF THE INCOME TAX ACT,1961.TO PROCEED WITH THE CALCULATION YOU HAVE NOT GIVEN THE COST OF AQUISITION , DATE THEREOF, PROBABLE DATE OF SALE,YOUR PROPOSITION FOR PERMISSIBLE INVESTMENTS.  THEN ONLY THE CALCULATION CAN BE PROCEEDED WITH

Send me the details on my email id, i will compute the capital gain & tax there on. And also suggest you how to reduce the amount of tax up to 0.

The details requird-

Descripttion of property. (Land/ house/ Plot)

Purchase date + date of any improvement you made on this property.

Purchase cost.

Sale Date (completion of sale)

Sale consideration.

also describe whether it is agriculture land or diverted land or urban land.