Aunt Li deposited a sum of temporarily unused money in the bank. The deposit period is two years, and the annual interest rate is 2.7%. After the maturity date, she not only gets the interest, but also pays 86.4 yuan of interest tax at a rate of 20%. Do you know how much Aunt Li saves? Please do the math.
李阿姨把一笔暂时不用的钱存入银行．存期是两年，年利率为2.7%，到期后她不但取得了利息，还按20%的税率上缴86.4元的利息税，你知道李阿姨存钱是多少元吗？请你帮助算一算．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">86.4 / (1/5)</gadget>
<output>432</output>

<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</output>

<gadget id="calculator">432 / 2 / 0.027</gadget>
<output>8_000</output>

<result>8_000</result>