Xiaoli deposits 2,000 yuan in the bank for a period of one year, and the interest after maturity is 45 yuan. What is the annual interest rate?
小丽将2000元存入银行，定期1年，到期后利息是45元，年利率是多少．
<gadget id="calculator">2_000 * 1</gadget>
<output>2_000</output>

<gadget id="calculator">45 / 2_000</gadget>
<output>9/400 = around 0.0225</output>

<result>9/400 = around 0.0225</result>