so.... Im a dumbass.... help pls!

I'm trying to see how bad I failed and cannot figure out the numbers LOL
So far, I got:
Worth
% of my grade:
25% Test #1 88
30% Test #2 71
35% Test #3
10% Paper
100% cumulative average so far = 78.73%

How did my professor come up with this? I would like to make an imaginary failing grade (because that's what I believe happened to my 3rd test) to see what my grade point average is if I failed.... but Idk how my professor got 78.73 from my other 2 test scores??

I added both test scores and divided by two to get the average and got 79.5, and since your test #2 is a bigger percentage of your grade that looks right to me

Quoting Rydicule91:" I added both test scores and divided by two to get the average and got 79.5, and since your test #2 is a bigger percentage of your grade that looks right to me"

thanks