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 many percent has the number of people participating in the painting and calligraphy interest group this semester increased compared to the previous semester?
光明小学上学期书画兴趣小组有100人，本学期有125人，本学期参加书画兴趣小组的人数比上学期增加了百分之几？
<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>