A certain city planned to plant 10 hectares of trees last year, but actually planted 20 hectares of trees. How many percent more trees were planted than planned?
某城市去年计划植树10公顷，实际植树20公顷，实际比计划多植百分之几？
<gadget id="calculator">20 - 10</gadget>
<output>10</output>

<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<result>1</result>