The state stipulates that the tax payment method for deposit interest is: interest tax = interest * 5%, and the annual interest rate of the two-year fixed deposit in the bank is 4.50%. How much did Xiao Li deposit in the principal two years ago?
国家规定存款利息的纳税办法是：利息税=利息*5%，银行两年定期储蓄的年利率是4.50%，今年小李取出两年到期的本金和利息，缴纳了利息税22.5元，小李两年前存入本金多少元．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">22.5 / (1/20)</gadget>
<output>450</output>

<gadget id="calculator">4.5 / 100</gadget>
<output>0.045</output>

<gadget id="calculator">450 / 0.045 / 2</gadget>
<output>5_000</output>

<result>5_000</result>