Liu Ming deposits 300 yuan of lucky money in the bank for 3 years on a regular basis. If the annual interest rate is 2.5%, he plans to donate the principal and interest to the snow-stricken area in the south after the maturity date. How much can he donate to the disaster area?
刘明将300元压岁钱存入银行定期3年，如果年利率是2.5%，到期后他准备将本息捐献给南方雪灾区，则可向灾区捐多少元．
<gadget id="calculator">2.5 / 100</gadget>
<output>0.025</output>

<gadget id="calculator">300 * 0.025 * 3</gadget>
<output>22.5</output>

<gadget id="calculator">300 + 22.5</gadget>
<output>322.5</output>

<result>322.5</result>