I have interest of 450 yuan. After paying 5% interest tax, how much interest should I get?
我有利息450元，缴纳5%的利息税后，应得利息多少元．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">450 * (1/20)</gadget>
<output>45/2 = around 22.5</output>

<gadget id="calculator">450 - (45/2)</gadget>
<output>855/2 = around 427.5</output>

<result>855/2 = around 427.5</result>