Mr. Li deposited 20,000 yuan in the bank with an annual interest rate of 3.33%. After the maturity, Mr. Li received an after-tax interest of 1898.1 yuan. How many years does Mr. Li live in deposits? (at 5% interest tax)
李先生把20000元存入银行，年利率是3.33%，到期后李先生获得税后利息是1898.1元．李先生存的是多少年期的存款．(按5%的利息税)
<gadget id="calculator">3.33 / 100</gadget>
<output>0.0333</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1_898.1 / 20_000 / 0.0333 / (19/20)</gadget>
<output>3</output>

<result>3</result>