Uncle Zhang deposits 10,000 yuan in the bank with a deposit period of two years and an annual interest rate of 3.9%. How much principal and interest can he get when he withdraws at maturity?
张叔叔把10000元钱存入银行，存期两年，年利率为3.9%，到期支取时，他可以得到本息多少元？
<gadget id="calculator">3.9 / 100</gadget>
<output>0.039</output>

<gadget id="calculator">10_000 * 0.039 * 2</gadget>
<output>780</output>

<gadget id="calculator">10_000 + 780</gadget>
<output>10_780</output>

<result>10_780</result>