A township planted 18 hectares this year, an increase of 3 hectares compared to last year. What percentage is the increase this year compared to last year?
某乡今年造林18公顷，比去年增加3公顷，今年比去年增加了百分之几？
<gadget id="calculator">18 - 3</gadget>
<output>15</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

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