medium · SAT Math

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?

  1. Usage increased by 15%.
  2. Usage increased by approximately 43% relative to its 2015 level.
  3. Usage increased by 75 percentage points.
  4. Usage increased by 15 percentage points.

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