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In 2015, 20% of a city's residents used public transportation. In 2020, 35% of the city's residents used public transportation. Which of the following statements correctly describes the change from 2015 to 2020 in the percentage of residents who used public transportation?
- Usage increased by 15%.
- Usage increased by approximately 43% relative to its 2015 level.
- Usage increased by 75 percentage points.
- Usage increased by 15 percentage points.
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