Percentages are ratios of an amount compared to 100. The percent change of an old to new value is equal to 100% x \({ new - old \over old }\).
Christine scored 87% on her final exam. If each question was worth 3 points and there were 270 possible points on the exam, how many questions did Christine answer correctly?
| 65 | |
| 78 | |
| 66 | |
| 68 |