Xiaoming's mother buys 10,000 yuan of national bonds for a fixed term of 3 years. If the annual interest rate for three years is 5%, how much can Xiaoming's mother get back when it expires? (interest tax free)
小明妈妈购买10000元国债，定期3年，如果三年的年利率是5%，到期时小明妈妈一共能取回多少元．(免利息税)
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">10_000 * (1/20) * 3</gadget>
<output>1_500</output>

<gadget id="calculator">10_000 + 1_500</gadget>
<output>11_500</output>

<result>11_500</result>