Dad deposits 20,000 yuan in the bank for one year, with an annual interest rate of 3.06%. Donate 20% of the interest to "Hope Project" when the plan expires. How much can dad donate?
爸爸将20000元存入银行，定期一年，年利率是3.06%．准备到期后把利息的20%捐给"希望工程"．爸爸能捐款多少元？
<gadget id="calculator">3.06 / 100</gadget>
<output>0.0306</output>

<gadget id="calculator">20_000 * 0.0306 * 1</gadget>
<output>612</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">612 * (1/5)</gadget>
<output>612/5 = around 122.4</output>

<result>612/5 = around 122.4</result>