On a drawing with a scale of 1:500, the length of a rectangular vegetable field is measured to be 5 cm and the width to be 4 cm. What is the actual area of the vegetable plot in square meters?
在比例尺是1：500的图纸上，测得一个长方形菜地的长为5厘米，宽为4厘米．这个菜地的实际面积是多少平方米？
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">5 / (1/500) / 100</gadget>
<output>25</output>

<gadget id="calculator">4 / (1/500) / 100</gadget>
<output>20</output>

<gadget id="calculator">25 * 20</gadget>
<output>500</output>

<result>500</result>