My mother’s monthly salary last year was 1,800 yuan. After subtracting 1,100 yuan according to the regulations, I paid personal income tax at a rate of 20%. How much did my mother pay in personal income tax last year?
妈妈去年的月工资是1800元，按规定减去1100元后按20%税率缴纳个人所得税，去年妈妈缴纳个人所得税多少元．
<gadget id="calculator">1_800 - 1_100</gadget>
<output>700</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">700 * (1/5)</gadget>
<output>140</output>

<gadget id="calculator">140 * 12</gadget>
<output>1_680</output>

<result>1_680</result>