On the school floor plan with a scale of 1:1000, the length of the rectangular playground is measured to be 8.5 cm and the width to be 4 cm. What is the actual area of the playground in square meters?
在比例尺是1：1000的学校平面图上，量得长方形操场的长是8.5厘米，宽是4厘米．操场的实际面积是多少平方米？
<gadget id="calculator">1 / 1_000</gadget>
<output>1/1_000 = around 0.001</output>

<gadget id="calculator">8.5 / (1/1_000) / 100</gadget>
<output>85</output>

<gadget id="calculator">4 / (1/1_000) / 100</gadget>
<output>40</output>

<gadget id="calculator">85 * 40</gadget>
<output>3_400</output>

<result>3_400</result>