SOLUTION: Kate took a test and she got a grade between 80% and 95%, inclusive. What is the greatest percent error she could have?

Question 1025395: Kate took a test and she got a grade between 80% and 95%, inclusive. What is the greatest percent error she could have?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
A fifth grader would tell yoy that obviously, if kates right answers were 80% or more,
she had at most errors,
but to "show your work", you have to pretend it is not obvious,
and write some inequalities.
= right answers (as percent of total questions/points)
= wrong answers (as percent)
Since
(the signs are flipped because we are multiplying times every expression related b those signs)

.
Kate's percent error was at most .
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