Mom has saved 20,000 yuan in education deposits, the deposit period is three years, and the annual interest rate is 5.4%. When it expires, how much interest can mom get? (Exemption from interest tax)
妈妈存了2万元教育存款，存期为三年，年利率5.4%，到期时，妈妈可以拿到多少元利息．(免征利息税)
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<gadget id="calculator">5.4 / 100</gadget>
<output>0.054</output>

<gadget id="calculator">20_000 * 0.054 * 3</gadget>
<output>3_240</output>

<result>3_240</result>