Mom bought 4,000 yuan of national debt in April 2011, fixed for five years, and the annual interest rate is 6.00%.
妈妈在2011年4月买了4000元的国债，定期五年，年利率是6.00%，到期时妈妈一共拿回多少元．
<gadget id="calculator">6 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">4_000 * (3/50) * 5</gadget>
<output>1_200</output>

<gadget id="calculator">4_000 + 1_200</gadget>
<output>5_200</output>

<result>5_200</result>