Miao Miao deposits 4,000 yuan in the bank for a period of 3 years with an annual interest rate of 3.25%. How much is the total principal and interest at maturity?
苗苗把4000元钱存入银行，存期3年，年利率是3.25%．到期时本金和利息一共多少元？
<gadget id="calculator">3.25 / 100</gadget>
<output>0.0325</output>

<gadget id="calculator">4_000 * 0.0325 * 3</gadget>
<output>390</output>

<gadget id="calculator">4_000 + 390</gadget>
<output>4_390</output>

<result>4_390</result>