Wang Fei deposited the accumulated pocket money of 800 yuan in the bank on the New Year's Day of 2006, and deposited it in full for one year. After the preparation expires, donate the interest to "Hope Project" to support out-of-school children in poverty-stricken areas. If the annual interest rate is calculated at 3.5%, how much can he donate to "Project Hope" when it is due?
王飞同学2006年元旦把积攒的800元零花钱存入银行，存整存整取一年．准备到期后把利息捐赠给"希望工程"，支援贫困地区的失学儿童．如果年利率按3.5%计算，到期时他可以捐赠给"希望工程"多少元．
<gadget id="calculator">3.5 / 100</gadget>
<output>0.035</output>

<gadget id="calculator">800 * 0.035 * 1</gadget>
<output>28</output>

<result>28</result>