math
posted by amanda .
Suppose that you are taking a course that has three exams which count for threefifths of your grade and a final which counts for twofifths of your grade. On your first three tests your scores on were 75, 80, and 74. To get an B in the course, you must have an average of at least 80 percent. What is the minimum score you need on the fourth test to get an B for the course? Round your answer to one decimal.
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