Percentages are ratios of an amount compared to 100. The percent change of an old to new value is equal to 100% x \({ new - old \over old }\).
Betty scored 74% on her final exam. If each question was worth 3 points and there were 210 possible points on the exam, how many questions did Betty answer correctly?
| 42 | |
| 60 | |
| 47 | |
| 52 |