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The population of a metropolitan city doubled every 8 years from 1975 to 1999. what was the percentage increase in population during this time?

The population of a metropolitan city doubled every 8 years from 1975 to 1999. what was the percentage increase in population during this time? Correct Answer 800%

Year 1975 to year 1999 = 24 years = three periods of '8 years' So, the population became (2 x 2 x 2 = 8) times of its initial population. Therefore, the population of the city increased to 8 x 100% = 800%.

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