The given table shows the total number
of students who applied for a computer
science course in five consecutive years.
(i) How many symbols are needed to
represent the number of students who
applied for a computer science course
in 2020?
(ii) How many more symbols are needed
to represent the number of students
in 2022 than in 2018?
| (i) | (ii) | |
|---|---|---|
| A | 70 | 60 |
| B | 90 | 50 |
| C | 90 | 40 |
| D | 70 | 40 |