Mingming’s family bought 1,500 yuan of construction bonds for three years. If the annual interest rate is 4.0%, how much is the interest at maturity?
明明家买了1500元建设债券，定期三年，如果每年的利率是4.0%，到期时利息是多少元？
<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1_500 * (1/25) * 3</gadget>
<output>180</output>

<result>180</result>