Final Calculations

It's that time of year again ... finals start on Monday. So, it's time for me to do some calculations. Not to brag, but I've been pretty constant throughout the semester with good grades, so finals shouldn't be too stressful.
So, what is the minium score I can make on each final and still make an A in the class?

Microbiology: 68
Organic Chemistry: 79
Spanish Literature: 72
Philosophy: 95

Funny that the one class that doesn't have anything to do with my major or my minor should require the highest final score, but it's the one class where the final is worth the most out of the overall grade, so it makes sense. Kind of. Bugger Philosophy. The organic final is worth the next most and consequently it requires a higher grade. Spanish and Microbiology are worth the same, but I have more extra credit in Microbiology (the same Microbiology where my professor told us that no extra credit would be given). My schedule is as follows: Monday I have Philosphy at 8am and Spanish at 1pm. Wednesday I have Organic at 1pm. Friday I have Microbiology at 8 am. And then I'm free until January!! I literally cannot wait. I wish I had a fast forward button so I could get through these next eight days. The end is so close, so tantalizingly close, but yet so far away! Sigh. One week and one day and I will be on my way home!