Tiantian deposited 4,000 yuan in the bank in August 2008 for two years, with an annual interest rate of 4.68%. How much is the real interest after maturity? (20% interest tax deducted)
甜甜2008年8月将4000元存入银行，定期两年，年利率是4.68%，到期后实得利息多少元．(扣20%的利息税)
<gadget id="calculator">4.68 / 100</gadget>
<output>0.0468</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 * 0.0468 * 2 * (4/5)</gadget>
<output>299.52</output>

<result>299.52</result>