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Rainfall recorded (in mm). City X: 2021 820, 2022 960, 2023 900. City Y: 2021 600, 2022 540, 2023 675. By what percent did the rainfall of City X fall from 2022 to 2023?

Competition practiceData & Probability
  • A6.67
  • B6.25
  • C5
  • D7.5

Step-by-Step Solution

The fall is 960 − 900 = 60 mm and the base for a percent decrease is the earlier value 960. So the decrease is (60 ÷ 960) × 100 = 6.25 percent. Using 900 as the base would wrongly give 6.67.
Answer: B) 6.25

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