On an exam, Mafuyu scored in the 20th percentile. If there were 50 students in the class, how many students scored lower than he
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In the given question, it is given that, the cost of telephone call, s, is $0.75 plus $0.25 times the number of minutes .
And we have to put the given informationin algebraic expression .
For the cost of telephone call, we have to use s and for the number of minutes, we need to use t .
So the required expression is