Use a formula containing letters to express: Uncle Wang bought a national bond in 2004, with a term of three years. The annual interest rate of this national bond is 3.32%.
用含有字母的式子表示：王叔叔2004年买了a元的国债，定期三年，这种国债的年利率为3.32%，到期时王叔叔可以得到本息是多少元．
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