If you deposit 300 yuan in the bank, the deposit period is two years, and the annual interest rate is 2.43%, how much after-tax interest can you get when it matures?
如果把300元存入银行，存期两年，年利率2.43%，到期时可得到税后利息多少元．
<gadget id="calculator">2.43 / 100</gadget>
<output>0.0243</output>

<gadget id="calculator">300 * 0.0243 * 2</gadget>
<output>14.58</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">14.58 * (4/5)</gadget>
<output>11.664</output>

<result>11.664</result>