Dongfeng Road Primary School has 1,680 students this year, an increase of 180 compared to last year. By what percentage is the increase in the number of students this year compared to last year?
东风路小学今年有学生1680人，比去年人数增加了180人，今年学生人数比去年增加了百分之几？
<gadget id="calculator">1_680 - 180</gadget>
<output>1_500</output>

<gadget id="calculator">180 / 1_500</gadget>
<output>3/25 = around 0.12</output>

<result>3/25 = around 0.12</result>