There were 100 people in the calligraphy and painting interest group of Guangming Primary School in the last semester, and 125 people in this semester. How much has the number increased in this semester?
光明小学上学期书画兴趣小组有100人，本学期有125人，本学期人数增加了百分之几？
<gadget id="calculator">125 - 100</gadget>
<output>25</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>