Question

Nicole usually scores between 89%

and 100% on her math quizzes,
unless the quiz is the day after a track
meet. On the quizzes she takes right
after a track meet, she has about an
11% decrease in her scores. If Nicole
had a track meet the day before a
quiz, what would she score on the
quiz?
A Between 70% and 78%
B Between 79% and 89%
C Between 90% and 99%
D Between 100% and 111%

Answer 1

B

Explanation:

Nicole usually scores between 89% and 100% on her math quizzes.

On the quizzes she takes right after a track meet, she has about an 11% decrease in her score, so she will earn 100% - 11% = 89% of her usual score.

1. 89% of 89% is

`0.89\cdot 89\%=79.21\%\approx 79\%`

2. 89% of 100% is

`0.89\cdot 100\%=89\%`

So, if Nicole had a track meet the day before a quiz, her score would be between 79% and 89%.