A certain village actually planted 20 hectares of forests last year, an increase of 4 hectares compared to the plan. What percentage is the increase?
某村去年实际造林20公顷，比计划增加了4公顷，增加了百分之几？
<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

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

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