How do i figure out what i need to get on the final exam to get an A?

my grade overall is a 96.5 and i want to get an A





my final is 10% of my grade





is there a certain formula i can use to figure this out?How do i figure out what i need to get on the final exam to get an A?
the best way is to multiply your first quarter grade by .45 and add that to your second quarter grade [times .45] then mess around with different grades you might get on the final, multiply by .1, and add to the first two.





example:


first quarter grade: 93.4


second quarter grade: 96.5


[possible] final grade: 90.2





93.4*.45 = 42.03


plus


96.5*.45= 43.425


plus


90.2*.1= 9.02


equals:


94.475





which would be about 95% for the over all grade.