Grandma Sun deposits 20,000 yuan in the bank for a fixed period of one year. The annual interest rate is 2.25%, and the interest tax is 5%.
孙婆婆把2万元钱存入银行，定期一年，年利率2.25%，利息税是5%，到期后孙婆婆可从银行领取税后利息多少元．
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</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">20_000 * 0.0225 * 1 * (19/20)</gadget>
<output>427.5</output>

<result>427.5</result>