Xiaoqiang's father saved 40,000 yuan for Xiaoqiang's three-year education savings, with an annual interest rate of 3.24%. After the expiration, Xiaoqiang plans to donate the interest earned to his friends in the Wenchuan earthquake-stricken area. How much money can Xiaoqiang donate to the disaster area? (Interest earned on education savings is not subject to interest tax)
小强爸爸为小强存了4万元三年期教育储蓄，年利率是3.24%．到期后，小强准备把所得的利息捐赠给汶川地震灾区的小伙伴，小强可以捐给灾区多少钱？(教育储蓄所得利息不需缴纳利息税)
<gadget id="calculator">4 * 10_000</gadget>
<output>40_000</output>

<gadget id="calculator">3.24 / 100</gadget>
<output>0.0324</output>

<gadget id="calculator">40_000 * 0.0324 * 3</gadget>
<output>3_888</output>

<result>3_888</result>