Xiaohong's family earns 5,000 yuan in February, and deposits 40% of the income in the bank for one year, with an annual interest rate of 2.25%. How much is the total amount of principal and after-tax interest due? (Interest tax is calculated at 5%)
小红家2月份收入5000元，把收入的40%存入银行，定期1年，年利率是2.25%．到期后应得本金和税后利息一共多少元？(利息税按5%计算)
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">5_000 * (2/5) * 0.0225 * 1</gadget>
<output>45</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">45 * (19/20)</gadget>
<output>171/4 = around 42.75</output>

<gadget id="calculator">5_000 + (171/4)</gadget>
<output>20_171/4 = around 5_042.75</output>

<result>20_171/4 = around 5_042.75</result>