Mom deposits 6,000 yuan in the bank, fixed for 2 years, and the annual interest rate is 2.25%. How much after-tax interest did mother withdraw?
妈妈在银行存款6000元，定期2年，年利率是2.25%．妈妈共取出税后利息多少元？
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</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">6_000 * 0.0225 * 2 * (4/5)</gadget>
<output>216</output>

<result>216</result>