某校2005年捐款1万元给希望工程,以后每年都捐款,计划到2007年共捐款4.75万元,问该校捐款的平均年增长率是多少?
人气:420 ℃ 时间:2020-02-18 19:37:01
解答
设该校捐款的平均年增长率为x.
则:1+(1+x)+(1+x)2=4.75,
解得:x1=-3.5(应舍去),x2=0.5,
故该校捐款的平均年增长率为50%.
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