What percentage of the marks depends on the report?
Again, there is no fixed percentage. The real marks earner is the software. However, to get those marks you need to describe in your report the qualities that earn the marks. Think of the report as the key that unlocks the credit due to the software. It’s a little bit like this. Suppose you have produced a software application and are trying to sell it in a shop. If it is in a plain brown box then, however good the software actually is, nobody will buy it. You need an informative box that describes its features.