Xiaoming's father intends to deposit 10,000 yuan in the bank, deposit and withdraw for three years, and the annual interest rate is calculated at 4%. How much is the total interest after three years?
小明的爸爸打算把10000元钱存入银行，整存整取三年，年利率按4%计算，三年后利息共有多少元？
<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">10_000 * (1/25) * 3</gadget>
<output>1_200</output>

<result>1_200</result>