Mr. Li spent 300 yuan to buy a stock in 1998. If this stock can increase in value by 40% every year on average, if Mr. Li keeps holding this stock, the total value of these stocks will exceed 1,500 yuan in the earliest few years.
李先生1998年花了300元购得一种股票，假如这种股票平均每年可增值40%，如果李先生一直持有这种股票，最早到多少年这些股票的总价值会超过1500元．
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