On the floor plan of the school teaching building with a scale of 1:400, the teaching building is 20cm long and 8.5cm wide. How many square meters does the teaching building actually occupy?
在比例尺是1：400的学校教学楼平面图上，量得教学楼长20cm，宽8.5cm，这座教学楼的实际占地面积是多少平方米？
<gadget id="calculator">1 / 400</gadget>
<output>1/400 = around 0.0025</output>

<gadget id="calculator">20 / (1/400) / 100</gadget>
<output>80</output>

<gadget id="calculator">8.5 / (1/400) / 100</gadget>
<output>34</output>

<gadget id="calculator">80 * 34</gadget>
<output>2_720</output>

<result>2_720</result>