The area of a school's rectangular playground is 3500 square meters. Due to expansion, the width will be expanded from 50 meters to 60 meters, and the length will remain unchanged. How many hectares does the expanded playground occupy?
某校方长方形操场的面积是3500平方米，因扩建，要把宽从50米扩建到60米，长不变．扩建好的操场占地多少公顷？
<gadget id="calculator">60 / 50</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">3_500 * (6/5)</gadget>
<output>4_200</output>

<gadget id="calculator">4_200 / 10_000</gadget>
<output>21/50 = around 0.42</output>

<result>21/50 = around 0.42</result>