Aunt Li deposits 50,000 yuan in the bank for a period of 3 years with an annual interest rate of 5.0%. How much after-tax interest can Aunt Li get after the maturity date? (tax rate 20%)
李阿姨把50000元钱存人银行，存期3年，年利率为5.0%．到期后李阿姨可得税后利息多少元？(税率为20%)
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50_000 * (1/20) * 3 * (4/5)</gadget>
<output>6_000</output>

<result>6_000</result>