Below is an example for calculating the final grade.  See the syllabus for details and the grading scale.

HW Grades:     20, 18, 25, 20, 26, 0, 25, 19, 27, 15
HW Possible:   20, 30, 30, 35, 30, 30, 35, 25, 40, 25

Test Grades:   36, 48, 45
Test Possible: 50, 50, 50

The overall HW percentage is essentially calculated as the average of individual HW percentages. In the above example we have [(20/20)+(18/30)+...+(15/25)]/10=0.662. The test percentages are 36/50=0.72, 48/50=0.96, and 45/50=0.90.  Thus, the final "class percentage" is 0.25(0.662) + 0.25(0.72) + 0.25(0.96) + 0.25(0.90) = 0.811, which is a B.
 
Click here to download an Excel file for the above example.