Ma Chao deposits 4,000 yuan in the bank for a fixed term of one year, with an annual interest rate of 1.98%. When it matures, how much interest can he get after deducting 20% interest tax.
马超将4000元钱存入银行，定期一年，年利率是1.98%，到期时，扣除20%的利息税后可得到利息多少元．
<gadget id="calculator">1.98 / 100</gadget>
<output>0.0198</output>

<gadget id="calculator">4_000 * 0.0198 * 1</gadget>
<output>79.2</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">79.2 * (4/5)</gadget>
<output>63.36</output>

<result>63.36</result>