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The population of town increases by 10% annually. If the present population is 22000, find the its population a year ago.

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`P+(P*10/100)`
`P+0.1P=1.1P`
a year pop was x
Next year`(x+x*10/100)=2200`
`x+0.1x=2200`
`1.1x=2200`
`x=2000`
1 year ago pop=2000.

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