Xiaohong bought 2,500 yuan treasury bonds, fixed for two years, with an annual interest rate of 4.5%, and donated the interest to "Hope Project" after maturity. How much can Xiaohong donate to "Project Hope".
小红买了2500元国库券，定期两年，年利率为4.5%，到期后，把利息捐给"希望工程"．小红可以把多少元捐给"希望工程"．
<gadget id="calculator">4.5 / 100</gadget>
<output>0.045</output>

<gadget id="calculator">2_500 * 0.045 * 2</gadget>
<output>225</output>

<result>225</result>