After the Spring Festival, Xiao Ming deposits 400 yuan of New Year's money in the bank, with an annual interest rate of 2.25%, and a deposit period of one year. When it expires, how much interest can Xiao Ming get. (taxes on interest are ignored)
春节过后，小明把400元压岁钱存入银行，年利率2.25%，存期一年．到期时，小明可以拿到利息多少元．(利息税忽略不计)
<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">400 * 0.0225 * 1</gadget>
<output>9</output>

<result>9</result>