Last year, among the students who participated in various sports interest groups in a certain school, girls accounted for the total (1/5). This year, the number of students in the whole school is the same as last year. accounted for 1/4 of the total, so how much more girls participated in various interest groups this year than last year?
去年某校参加各种体育兴趣小组的同学中，女生占总数的(1/5)，今年全校的学生数和去年的一样，今年全校参加各种体育兴趣小组的人数增加了20%，其中女生占总数的(1/4)，那么今年女生参加各种兴趣小组的人数比去年增加多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

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

<gadget id="calculator">(6/5) * (1/4)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/10) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) / (1/5)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>