Xiaohua's family bought 1,000 yuan of construction bonds, fixed for five years, and if the annual interest rate is 7.8%, how much yuan can they withdraw at maturity.
小华家买了1000元建设债券，定期五年，如果每年的利息是7.8%，到期时一共能取出多少元．
<gadget id="calculator">7.8 / 100</gadget>
<output>0.078</output>

<gadget id="calculator">1_000 * 0.078 * 5</gadget>
<output>390</output>

<gadget id="calculator">1_000 + 390</gadget>
<output>1_390</output>

<result>1_390</result>