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Salam's average in four test is 80%. What mark does she need to score in her fifth test to make her average 84%?

Salam's average in four test is 80%. What mark does she need to score in her fifth test to make her average 84%? Correct Answer 100%

the sum of the first 4 test scores is 4*80 = 320.  the sum of ALL 5 scores to be 5*84 = 420.  ∴she need score in her fifth test = 420 - 320 = 100. (ans)

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Salma's average in four tests is 80% . what mark does she need to score in her fifth test to make her average 84% ?