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The population of a town double every 10 years from 1960 to 1990.what was the percent increase in population during this time

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it doubled 3 times in the 30 years. So, it is now 8 times as great.

That is 800% as much as it started.

However, if you want the annual growth rate, that is 2^(1/10) = 1.07 or 7% per year

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