Teacher Zhang deposits 20,000 yuan in the bank for 2 years, with an annual interest rate of 4.25%. How much can Mr. Zhang get back after the expiration?
张老师把20000元钱存入银行，定期2年，年利率为4.25%．到期后张老师共可取回多少元？
<gadget id="calculator">4.25 / 100</gadget>
<output>0.0425</output>

<gadget id="calculator">20_000 * 0.0425 * 2</gadget>
<output>1_700</output>

<gadget id="calculator">20_000 + 1_700</gadget>
<output>21_700</output>

<result>21_700</result>