Mom deposits 4,000 yuan in the bank for 3 years, with an annual interest rate of 5.4%. How much after-tax interest will mom get when it matures? (Interest tax is 5%)
妈妈在银行存款4000元，定期3年，年利率为5.4%，到期时，妈妈得税后利息多少钱？(利息税是5%)
<gadget id="calculator">5.4 / 100</gadget>
<output>0.054</output>

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

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">4_000 * 0.054 * 3 * (19/20)</gadget>
<output>615.6</output>

<result>615.6</result>