Sale (in thousands) of five battery types, 2015–2021.
| Year | 4AH | 7AH | 32AH | 35AH | 55AH |
|---|---|---|---|---|---|
| 2015 | 75 | 144 | 114 | 102 | 108 |
| 2016 | 90 | 126 | 102 | 84 | 126 |
| 2017 | 96 | 114 | 75 | 105 | 135 |
| 2018 | 105 | 90 | 150 | 90 | 90 |
| 2019 | 90 | 75 | 135 | 75 | 90 |
| 2020 | 105 | 60 | 165 | 45 | 120 |
| 2021 | 115 | 85 | 160 | 100 | 145 |
In the case of which type of battery was there a continuous decrease in sales from 2015 to 2020?
A4AH
B7AH ✓ Correct
C32AH
D35AH
Correct answer: (B) 7AH
Explanation
The answer is 7AH.
The 7AH sales are 144, 126, 114, 90, 75 and 60 thousand from 2015 to 2020.
Each year the figure is lower than the year before.
So the 7AH battery shows a continuous decrease from 2015 to 2020.
The other types rise in one or more of these years.
So only the 7AH battery falls each year.
So the answer is 7AH.
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