Test scores

Jo's test scores on the first four 100 point exams are as follows: 96,90,76, and 88. If all exams are worth the same percent, what is the minimum test score necessary on his last exam to earn an A grade in the class (90% or better)?

Correct answer:

x =  100

Step-by-step explanation:

(96+90+76+88+x)/5=90

x = 100

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