Uncle Zhang deposits 5,000 yuan in the bank for a period of one year (the annual interest rate for one year is 1.98%). According to state regulations, the interest earned shall be subject to 20% interest tax. After the maturity date, how much interest does Uncle Zhang actually earn?
张大爷把5000元存入银行，存期1年(一年期年利率是1.98%)．按国家规定，所得的利息应缴纳20%的利息税．到期后，张大爷实际所得利息是多少元？
<gadget id="calculator">1.98 / 100</gadget>
<output>0.0198</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">5_000 * 0.0198 * 1 * (4/5)</gadget>
<output>79.2</output>

<result>79.2</result>