Measure a rectangular vegetable field on a plan with a scale of 1:4000. Its length is 2.5 cm and its width is 1.2 cm. What is the actual area of this vegetable field in square meters?
在比例尺是1：4000的平面图上测量一块长方形菜地，其长是2.5cm，宽是1.2cm，这块菜地的实际面积是多少平方米？
<gadget id="calculator">1 / 4_000</gadget>
<output>1/4_000 = around 0.00025</output>

<gadget id="calculator">2.5 / (1/4_000) / 100</gadget>
<output>100</output>

<gadget id="calculator">1.2 / (1/4_000) / 100</gadget>
<output>48</output>

<gadget id="calculator">100 * 48</gadget>
<output>4_800</output>

<result>4_800</result>