<p>with those actual numbers, no doubt in my mind the prof screwed up the math when entering online. Denominator should have remained at 1000. Extra credit was 2% of final grade(if perfect score was obtained), sounds reasonable.
2 points would boost a half grade to some, depending on their final grade. A final grade of 83 or 84 would still be a B even with 20/20 on the extra credit. An 85 or 86 would bump to a B+ In your D’s case, a B+ to an A-, which is why she did the extra credit…to hopefully bump a half grade up…</p>