The average quiz score for 8 student is 5. The scores for 7 of the 8 students are shown. What's the score of the 8th student?

r = 72% = 0.72

Step-by-step explanation:

This case is a compound interest case. But the interest is accumulated negatively every week.

Total Amount Compounded with compound interest is calculated as

A = P (1 + r)ᵗ

P = principal/initial amount invested = $360

r = rate of increase weekly = -28% = - 0.28

t = time period that passes = t

A = 360 (1 - 0.28)ᵗ

A = 360 (0.72)ᵗ

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