Yes that may be true ,
1560 must have some taxes included in it.
And the discount is only on ticket base price ,not on taxes.
And...
more... this holds true for my other ticket on 1 August in second AC From Rewari to Jamnagar
The ticket base price is 2000 and 99.80 rs tax= 2100
For current ticket ,discount will be 2000*0.1=200
So base ticekt price will be 1800 +100 (for tax)=1900
and the same is ticket price for current in Second AC from rewari to Jamnagar .