Obviously Dad got a bonus of 100 yuan. He saved for Mingming's education. The education savings is fixed for three years, and the annual interest rate is 3%. After the maturity, how much interest can Mingming's father get? (Education savings are exempt from paying interest tax)
明明爸爸拿到一笔100元奖金．他为明明存了教育储蓄．教育储蓄定期三年，年利率是3%，到期后，明明的爸爸可以获得利息多少元？(教育储蓄免交利息税)
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">100 * (3/100) * 3</gadget>
<output>9</output>

<result>9</result>