Robert graded his friend Sam's practice test, and gave him a 72%. Sam checked it again and found that he really made 80%. Robert said, "Relax; I only made an error of 8%." Is Robert correct?
Responses
AYes; 80% − 72% = 8%.
Yes; 80% − 72% = 8%.
BYes; 8% less than the score of 80% would be 72%.
Yes; 8% less than the score of 80% would be 72%.
CNo; Robert actually made an error of 10%, since 8/80 = .10.
No; Robert actually made an error of 10%, since 8/80 = .10.
DNo; 80 ÷ 72 = 1.11, so the error was 11%.