Uncle Zhang's monthly salary is 4,500 yuan, and the part that exceeds 3,500 yuan needs to pay 3% personal income tax. How much should he pay personal income tax per month?
张叔叔月薪为4500元，超过3500的部分需要缴纳3%的个人所得税．他每月应纳个人所得税多少元？
<gadget id="calculator">4_500 - 3_500</gadget>
<output>1_000</output>

<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">1_000 * (3/100)</gadget>
<output>30</output>

<result>30</result>