Can someone help me calculate a possible grade in my class

Hypothetically, if i end up getting this what would my overall grade be estimated?

5 midterms, they all count for the 60% of final grade. = C-, C, B+, A-
Online quizzes: let's say I get 8% out of the 10% in the final grade
Final counts for 30%: I get a B+

Let's make a numerical grading scale
A-, A, A+ = 13,14,15
B-, B, B+ = 10,11,12
C-,C, C+ = 7,8,9

So you have:
(7 + 8 + 12 + 13) / 4 * 0.6 = 6 points from *four* midterms
80% * 15 * 0.1 = 1.2 points from quizzes
12 * 0.3 = 3.6 from final
6 + 1.2 + 3.6 = 10.8 = B- or more likely, B

Alternately, using percentages,
C = 75%, C- = 72%, B+ = 88%, A- = 90%

You have
(75 + 72 + 88 + 90)/4 * 0.6 = 81.25 * 0.6 = 48.75 on midterms
8 on quizzes
88 * .30 = 26.4 on final
For a grand percentage point total of 48.75 + 8 + 26.4 = 83.15
which, again is somewhere in the B- to B range.