Quickie math help

[magepro99]

Hi, I have a history final in my class, and I'm wonder how hard I have to try...

For the first part of the final, I got 780 points out of 950 possible. The first part is 15% of my grade.

The second part I have not done yet, but it is 10% of my grade.

I currently have a 93.82% in that class, how well do I have to do on the second part in order to maintain an A? (A= 89.5%)

[Kabuto]

current grad*grade worth+frist partte exame*its worth+second part of exam*its worth=89.5%
(.9382)(.75)+(78/95)(.15)+.10x=.895
x=25913/38000
x=~.682

so at lest 68% to kep A

[magepro99]

Thanks!