Tax Adjustment Set up

I am trying to add two adjustments for same net discount. But it is showing different value.

For ex,

   

Basic Price		100
Discount		10
Net of Discount		90
SGST	10%	9
CGST	10%	9
Invoice Value		108

SGST is calculating 10% from "Net of discount",i.e, 9.

CGST should also calculate from "Net of discount" and it should also come as 9, but it is reflecting different value.

Please help me, how to proceed with this.

I have used below adjustments and tried but nothing helped.

  

1	% of Base Price
2	% of Current Net Price
3	% of Cost
4	Cost Plus Amount
5	Add on Amount
6	Add on Variable Amount
7	Add on Formula Amount
8	Add on User Program Amount