Hey there,
Pretend that 50 = 100
And that 5 = 10.
I did a 100 test unit test, and I got 10% wrong.
If you think about this, the answer would be 90%
So, it's the same in this case,
50 in half of 100
5 is half of 10.
So . . .
This would mean that your correct answer would be 90% because 5 in this case is to be considered to be 10.
Your correct answer is . . . .
[tex]\boxed{\boxed{90 \ would \ be \ your \ correct \ answer }}[/tex]
Hope this helps
~Jurgen