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Mathematics, 28.12.2019 12:31 ahoney2233

On thursday 30 students went to afterschool tutoring on friday six students went what is the percent decrease in the number of students who went to tutoring
a. 20%
b. 80%
c. 400%
d. 500%
i know the answer is b. but here is the question i need with.
brittany chose a as the correct answer. how did she get this answer?
and

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