Xiaohong's mother deposits 5,000 yuan in the bank for a period of one year. If the annual interest rate is 2.79%, how much after-tax interest can she get when it matures?
小红的妈妈把5000元钱存入银行，存期一年，如果年利率为2.79%，到期时可得税后利息多少元．
<gadget id="calculator">2.79 / 100</gadget>
<output>0.0279</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">5_000 * 0.0279 * 1 * (4/5)</gadget>
<output>111.6</output>

<result>111.6</result>