Xiaohua’s family income is 4,000 yuan in January, and 20% of the income is deposited in the bank for a period of one year. It is calculated according to the latest bank deposit rate of 2.25% implemented by the People’s Bank of China on December 23, 2008. After maturity, 5% will be paid. After interest tax, how much is the actual interest?
小华家一月份收入4000元，把收入的20%存入银行，定期一年，按照2008年12月23日中国人民银行最新执行的银行存款利率2.25%计算，到期后，缴纳5%的利息税后，实得利息多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4_000 * (1/5)</gadget>
<output>800</output>

<gadget id="calculator">2.25 / 100</gadget>
<output>0.0225</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">800 * 0.0225 * 1 * (19/20)</gadget>
<output>17.1</output>

<result>17.1</result>