the population of snowtown was 4500 in 1990.In 1994,it had decreased to 3600.Find the percent decrease in population during those four years.如果有公式也一起给我,给个详解

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the population of snowtown was 4500 in 1990.In 1994,it had decreased to 3600.Find the percent decrease in population during those four years.如果有公式也一起给我,给个详解

原意：1990年……的人口是4500人,在1994年则下降到3600.求下降率.
（4500－3600）/4500＝20％

。。。。。。。。。。。。。。看不太懂。懂

（1-x)^4*4500=3600 x=5.43% 设X是年降低率 1991年的人口是（1-x)*4500 1992年是1991年人口*（1-x)=(1-x)^2*4500 以此类推

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