Mom deposits 10,000 yuan in the bank with an annual interest rate of 2.7%. After the maturity, mother pays 40.5 yuan of interest tax. How many years does the mother deposit?
妈妈将10000元存入银行，年利率为2.7%，到期后妈妈交纳利息税40.5元．妈妈存的是几年期存款？
<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</output>

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

<gadget id="calculator">40.5 / 10_000 / 0.027 / (1/20)</gadget>
<output>3</output>

<result>3</result>