Xiangshan School originally had 700 students, 280 graduated in July, and 350 new students were recruited in September. At this time, the number of students in Xiangshan School increased by what percentage?
象山学校原有学生700人，七月份毕业280人，九月份招入新生350人，这时象山学校的学生比原来增加百分之几？
<gadget id="calculator">350 - 280</gadget>
<output>70</output>

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

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