In March of this year, Aunt Wang deposited 20,000 yuan in the bank with a deposit period of one year and an annual interest rate of 2.25%. After paying 5% interest tax at maturity, how much is the actual interest?
今年3月份，王阿姨把20000元存入银行，存期一年，年利率2.25%，到期缴纳5%的利息税后，实得利息多少元．
<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">20_000 * 0.0225 * 1 * (19/20)</gadget>
<output>427.5</output>

<result>427.5</result>