On a plan with a scale of 1:2000, the upper base of a trapezoidal vegetable field in Yuexing Farm is 3 cm, the lower base is 5 cm, and the height is 4 cm. What is the actual area of the vegetable field in square meters?
在比例尺是1：2000的平面图上，量得悦兴农场中一块梯形菜地的上底是3厘米，下底是5厘米，高是4厘米．这块菜地的实际面积是多少平方米？
<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">3 / (1/2_000) / 100</gadget>
<output>60</output>

<gadget id="calculator">5 / (1/2_000) / 100</gadget>
<output>100</output>

<gadget id="calculator">60 + 100</gadget>
<output>160</output>

<gadget id="calculator">4 / (1/2_000) / 100 / 2</gadget>
<output>40</output>

<gadget id="calculator">160 * 40</gadget>
<output>6_400</output>

<result>6_400</result>