问题标题：
关于effectiveannualrate的美国数学题Stevenpurchased1000sharesofacertainstockfor$30,000(includingcommissions).Hesoldtheshares2yrlaterandreceived$34,400afterdeductingcommissions.Findtheeffectiveannualrateofreturno
问题描述：
关于effectiveannualrate的美国数学题
Stevenpurchased1000sharesofacertainstockfor$30,000(includingcommissions).Hesoldtheshares2yrlaterandreceived$34,400afterdeductingcommissions.Findtheeffectiveannualrateofreturnonhisinvestmentoverthe2-yrperiod.(Roundyouranswertotwodecimalplaces.)
董保良回答：
presumeeffectiveannualrate=x
30(1+x)²＝34.4,
x=0.07(twodecimalplaces.)
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