In January 2013, the annual interest rate was 4.25% for one year. Li Ming saved 4,000 yuan at that time. If the interest tax is 20%, how much interest can he get when it matures?
2013年1月，一年定期的年利率是4.25%，李明当时存了4000元，如果利息税为20%，到期时可得利息多少元．
<gadget id="calculator">4.25 / 100</gadget>
<output>0.0425</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">4_000 * 0.0425 * 1 * (4/5)</gadget>
<output>136</output>

<result>136</result>