Chengguan Town planted 20 hectares of forests last year, and 25 hectares this year. What percentage is the increase this year compared to last year?
城关镇去年造林20公顷，今年造林25公顷，今年比去年增加了百分之几？
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

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