Teacher Li bought some three-year treasury bonds with an annual interest rate of 3.14%. After the national debt expired, a total of 10,942 yuan was exchanged for cash. How much national debt did Mr. Li buy?
李老师买了一些三年期的国债，当时的年利率是3.14%．国债到期后，共兑换现金10942元，李老师买了多少元的国债？
<gadget id="calculator">3.14 / 100</gadget>
<output>0.0314</output>

<gadget id="calculator">0.0314 * 3</gadget>
<output>0.0942</output>

<gadget id="calculator">1 + 0.0942</gadget>
<output>1.0942</output>

<gadget id="calculator">10_942 / 1.0942</gadget>
<output>10_000</output>

<result>10_000</result>