Thanks for your question!
There is no specific budget for your project, rather it is up to you to determine what is a reasonable cost for your project. In terms of representing this in your report, a breakdown of what the different costs for different aspects of the project is preferred over a lump sum for the total project.
If you haven’t already, I recommend taking a look at our FAQs: Big Tricky Questions document (which can also be found in the Resources section) which talks a bit about how to determine what an appropriate budget is for your project.
I hope this helps!