Urgent :Service Tax and VAT

I am selling Softwares....

on of my bill is Invoiced as

Basic Amount                     100

VAT @ 4%                         4

Service Tax (104*10.30%)   10.712 

Total:                                 114.712

My question is whether service tax calculated is correct or it should have been charged only on 100 .i.e 10.30 only and not10.712

Please Provide reliable answer.

And answer if you are 101% sure