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Algebra

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Moderate

Decay of Population

ALGEBR-UNKWOP

There was a town in Colorado that had a huge population when mining of coal was at its height. Over time, the need for mining has dropped.

If the population was $117,000$ in $1925$ and has decreased at rate of $2$% a year for $90$ years, how many people live there in $2015$?

A

About $0$

B

About $18,990$

C

About $7,555$

D

About $23,343$