There are 700 students in Baoshan Primary School. After 280 students graduated, 350 new students were recruited. At this time, the number of students in Baoshan Primary School increased by what percentage?
宝山小学有700名学生，280人毕业后，又新招了350名新生．这时宝山小学学生数比原来增加了百分之几？
<gadget id="calculator">700 - 280</gadget>
<output>420</output>

<gadget id="calculator">350 - 700</gadget>
<output>-350</output>

<gadget id="calculator">420 + (-350)</gadget>
<output>70</output>

<gadget id="calculator">70 / 700</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>