I charge 250 for just building .On top of the build cost. I also avoid editing the Os with very specific and possible technically challenging to the consumer .
Nice job, looks like a good system overall. Only see two things to improve:
It sounds like your friend mostly needs a decent modern build that can run Office and Accountant software, but I could be wrong here. If you are on a tight budget I’d recommend a Ryzen 3 3200G APU (Same price, same amount of cores + graphics). By combining GPU and CPU into one, you reduce the number of mechanical failure points, and you save around $130 bucks.
With a 3200 CPU, I’d also look for a B450 or B550 motherboard. Perhaps something like the Aorus B450 AORUS ELITE, with an HDMI and DVI exit for two screens. Of course, you could also get an MSI A320M-A Pro MAX, though not sure I trust it to be anything other than cheap. If you want dual screens, the Aorus B450I Pro which I have has two HDMI exits that can drive two separate screens for sure.
In total you’d have saved around $100 bucks, and cleared an upgrade path to the 8c16t 4700G as well for the future - which would then also be performant enough for a 3080 Ti to be installed if you wanted to do that. How is that for an upgrade path?
With all that said, don’t go out and buy these new parts I showed you just to change this build - not worth the hassle to change what is already built. You did a decent job! Be proud of that fact, and remember to do some better research next time around! Great work!