Income tax calculation on capital gains

Those long  capital gains are from sale of multiple equity scrips. All stocks holder for more than 1 year.  I want to know my income tax would be 12 lakhs ( bcoz 15% of total long term capital gains 80 L) or 24 lakhs ( 30% of income from sale of equity gains amount as per income tax slab). Just for a simple  basic understanding , explain this ? 

Tax on LTCG  on equity shares and equity oriented MFs  (above 1 lakh) is 10%.   If shares are bought before 31st January  2018, gains upto Jan 31,2018 would be grandfathered.

I

Thank you,

In that case, my total income tax liability to government is 8 lakhs ( irrespective of 30 % income slab).  Correct me if my understanding is wrong?

Just enter capital gains data in ITR , ITR form automatically calculates tax to be paid.

It should be 10% + surcharges, usually end up at 13% odd.