Granny Li deposited 20,000 yuan in the bank on January 5, 2009, with an annual interest rate of 4.25%. By January 5, 2013, how much will Granny Li get back the principal and after-tax interest?
李婆婆2009年1月5日把2万元钱存入银行，年利率是4.25%，到2013年1月5日，李婆婆能取回本金和税后利息一共多少元？
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<gadget id="calculator">4.25 / 100</gadget>
<output>0.0425</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">20_000 * 0.0425 * 4 * (4/5)</gadget>
<output>2_720</output>

<gadget id="calculator">20_000 + 2_720</gadget>
<output>22_720</output>

<result>22_720</result>