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The population of a town is decreasing at a rate of 5.1% per year. The city council believes they will have to close another elementary

The population of a town is decreasing at a rate of 5.1% per year. The city council believes they will have to close another elementary school when the population reaches 84 000. If there are currently 120 000 people living in the town, how long do they have before an elementary school will need to be closed?

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