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 |
What is the approximate percentage increase in the sales of 55AH batteries in 2021 compared to 2015?
A28%
B31%
C33%
D34% ✓ Correct
Correct answer: (D) 34%
Explanation
The answer is about 34 percent.
The 55AH sales were 108 thousand in 2015 and 145 thousand in 2021.
The increase is 145 minus 108, which is 37 thousand.
As a percent of 108, this is 37 divided by 108, times 100.
That is about 34.25 percent, which rounds to 34.
The other options do not match this value.
So the answer is about 34 percent.
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