Yuying Primary School has 350 people participating in the interest group this year, an increase of 100 people over last year. How much is the increase over last year?
育英小学今年参加兴趣小组的有350人，比去年增加了100人，比去年增加了多少
<gadget id="calculator">350 - 100</gadget>
<output>250</output>

<gadget id="calculator">100 / 250</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>