Wang Hong deposits 400 yuan in the bank for a period of 3 years, with an annual interest rate of 2.5%. How much interest will Wang Hong get at that time? (taxes on interest are ignored)
王红把400元钱存入银行，定期3年，年利率2.5%，到时王红可得利息多少元．(利息税忽略不计)
<gadget id="calculator">2.5 / 100</gadget>
<output>0.025</output>

<gadget id="calculator">400 * 0.025 * 3</gadget>
<output>30</output>

<result>30</result>