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The population increased 80 percent in 5 years. The current population is 18,000. find five years ago.

18,000 * 0.80 = 14,400
18,000 - 14,400 = 3,600

3,600 is the population five years ago?

to check:

3,600 * 5 = 18,000

No, you did not do it correctly.

Let X be the population 5 years ago.
X*(1.8) = 18,000
X = 10,000

A city's population is currently 22,000 and is growing by 4.6% each year. In how many years will the town's population reach 55,000?

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