Vat percentages for free lancer webdesigner

Hello friends,

I am freelancer website developer.
Currently prepared on website for one compony. Now compoiny asking for the INVOICE/BILL for the same.

Actually my bill is 18000 rupees. but dont know that VAT is applied in my bill or not. PLease let me know the Percentages for such bills.

I am from Gujarat, Please let me know as soon as possible.

How much percentages of VAT or other tax i have to add in my invoice.

Waiting for prompt reply