The following table gives the number of different types of batteries sold by a company over the years (numbers in hundreds).
|
Type of battery → |
7 AH |
32 AH |
35 AH |
55 AH |
|
Year ↓ |
||||
|
2018 |
20 |
30 |
40 |
50 |
|
2019 |
40 |
35 |
45 |
45 |
|
2020 |
50 |
40 |
40 |
40 |
|
2021 |
40 |
50 |
50 |
45 |
|
2022 |
45 |
45 |
35 |
55 |
What is the difference in the number of 7AH batteries sold in 2021 and 2022?
1
200
2
700
3
300
4
500