amy's score = 90th percentile out of 80
amy' score = 90/100*80 = 72, this means there were 8 scores above her.
72/80
second class = 19 were higher than amy
100-19 = 81
81/100
combine scores
(72+81)/180 = 153/180 = 85%.
Another way of looking at this problem is.
Amy score between 90th and 81st percentile
there is only one option among the answer choices.
Hope this helps.
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