The chemistry grade breakdown is 40% of the test average, 25% of the lab average, 10%
of the on-line average, and 25% of the final exam. A student had a test average of 87.5
a lab average of 95.3, an on-line average of 98.7 and a final exam grade of 85.0.
a) What was the student's overall average?
b) What does the student need on the final to get an overall average of 93.0?