Long term Capital Gain

Hi,
Following are the queries :-
1)If a business property will be sold this year which attracts Long Term Capital Gain Tax the same would be payable as Advance Tax in 2 remaining instalments i.e 15th Dec and 15th March ?
2)Further to calculate Long Term Capital Gain Tax rate will be 20% or 20.8% which is inclusive of cess @ 4%: effective from 01.04.18 ??