Mom deposits 15,000 yuan in the bank, deposits and withdraws for two years, and the annual interest rate is 2.70%. How much after-tax interest can mother get when it is due?
妈妈把15000元钱存入银行，整存整取两年，年利率是2.70%．到期时妈妈可得税后利息多少元？
<gadget id="calculator">2.7 / 100</gadget>
<output>0.027</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">15_000 * 0.027 * 2 * (4/5)</gadget>
<output>648</output>

<result>648</result>