In 2005, my country announced a new personal income tax collection standard. Personal income below 1,600 yuan is not taxed, and the monthly income exceeds 1,600 yuan. The part that exceeds 1,600 yuan is taxed step by step. Personal income tax is levied at 10% on the yuan part. Xiao Ming’s mother’s monthly income is 3,500 yuan. How much personal income tax does she have to pay every month?
2005年我国公布了新的个人所得税征收标准，个人收入1600元以下不征税，月收入超过1600元，超过的部分分步缴税，超过500元的按5%征收个人所得税，超过501-2000元的部分按10%征收个人所得税，小明的妈妈月收入是3500元，她每月要缴纳多少元个人所得税？
<gadget id="calculator">3_500 - 1_600</gadget>
<output>1_900</output>

<gadget id="calculator">1_900 - 500</gadget>
<output>1_400</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1_400 * (1/10)</gadget>
<output>140</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">500 * (1/20)</gadget>
<output>25</output>

<gadget id="calculator">140 + 25</gadget>
<output>165</output>

<result>165</result>