Question
The population of a town grows by 25% in the first year,
declines by 20% in the second year, and rises by 30% in the third year. What is the total percentage change in the population over 3 years?Solution
Let the initial population be 100.  1st year: Population after a 25% increase = 125.  2nd year: Population after a 20% decrease = 100.  3rd year: Population after a 30% increase = 130.  Overall percentage change = (130 - 100) / 100 × 100 = 30%.  The overall percentage change is an increase of 30%.
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