Xiao Li's mother had a total income of 50,000 yuan in September, and she deposited 40% of it in the bank for two years, with an annual interest rate of 4.1%. How much can she get back the principal and interest after maturity?
小李的妈妈九月份共收入50000元，她把其中的40%存入银行，定期二年，年利率是4.1%．到期后她共可以取回本金和利息多少元？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50_000 * (2/5)</gadget>
<output>20_000</output>

<gadget id="calculator">4.1 / 100</gadget>
<output>0.041</output>

<gadget id="calculator">50_000 * (2/5) * 0.041 * 2</gadget>
<output>1_640</output>

<gadget id="calculator">20_000 + 1_640</gadget>
<output>21_640</output>

<result>21_640</result>