Teacher Zhang said that after deducting the 3,500 yuan tax exemption last month, the part is 450 yuan. If the personal income tax is paid at a rate of 2%, how much tax should be paid.
张老师说上月扣除3500元个税免征额后的部分是450元，如果按2%的税率缴纳个人所得税，应缴纳税款多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">450 * (1/5)</gadget>
<output>90</output>

<result>90</result>