Bill knows from reading his syllabus in Geometry/Stats that the average of his chapter tests accounts for 65% of his overall grade. He also knows that the final exam counts as 35% of his final grade.

Suppose that Bill averages 85% on all his chapter tests. Determine the range of grades that he would need on his final exam to get a ‘B’ in the class (80 – 90%).

Determine the range of grades that he would need on his final exam to get a ‘C’ in the class (70 – 80%).