On a school building plan with a scale of 1:2000, the length of the playground is 5 cm and the width is 4 cm. What is the actual area of the playground in square meters?
在一幅比例尺为1：2000的校舍平面图上量得操场的长是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 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

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

<gadget id="calculator">4 / (1/2_000) / 100</gadget>
<output>80</output>

<gadget id="calculator">100 * 80</gadget>
<output>8_000</output>

<result>8_000</result>