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关于effective annual rate的美国数学题

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关于effective annual rate的美国数学题
Steven purchased 1000 shares of a certain stock for $30,000 (including commissions).He sold the shares 2 yr later and received $34,400 after deducting commissions.Find the effective annual rate of return on his investment over the 2-yr period.(Round your answer to two decimal places.)
presume effective annual rate=x
30(1+x)²=34.4,
x=0.07(two decimal places.)