There were 150 students in the first grade of Beijing Normal University Experimental School last year, and this year there are 30 more students. What percentage is the increase this year compared to last year?
北师大实验学校去年一年级有学生150人，今年增加30人，今年比去年增加百分之几？
<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>