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The table below shows the grading scale for Ms. Gray's social studies class.


A 90%–100%
B 80%–89%
C 70%–79%


Part A: Pick a number between 21 and 29. This number will represent how many points you earned. If you have a pop quiz worth a total of 30 points, using the number you selected, calculate the percentage you earned on the test. Show each step of your work.

Part B: Based on the percentage found in Part A, what grade would you earn using the grading scale provided? Explain your answer.