Zhang Nan’s mother bought financial bonds three years ago, with an annual interest rate of 5.1%, and received a total of 23,060 yuan in principal and interest after maturity. How much financial bonds did Zhang Nan’s mother buy three years ago?
张楠的妈妈3年前买的金融债卷，年利率是5.1%，到期后共得到本金和利息23060元，问三年前张楠的妈妈买了多少元金融债券？
<gadget id="calculator">5.1 / 100</gadget>
<output>0.051</output>

<gadget id="calculator">0.051 * 3</gadget>
<output>0.153</output>

<gadget id="calculator">1 + 0.153</gadget>
<output>1.153</output>

<gadget id="calculator">23_060 / 1.153</gadget>
<output>20_000</output>

<result>20_000</result>