The planned afforestation is 12 hectares, and the actual afforestation is 15 hectares. How many percent has the actual afforestation increased compared with the planned afforestation?
计划造林12公顷，实际造林15公顷，实际造林比计划造林增加了百分之几？
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

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