Uncle Wang deposits 4,000 yuan in the bank for 3 years as a lump sum, with an annual interest rate of 5.00%. How much is the interest at maturity?
王叔叔把4000元存入银行，整存整存3年，年利率为5.00%，到期有利息多少元？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">4_000 * (1/20) * 3</gadget>
<output>600</output>

<result>600</result>