On a plan with a scale of 1:1000, the length of the playground is 4 cm and the width is 2.5 cm. Find the actual area of the playground.
在比例尺1：1000的平面图上，量得操场的长为4厘米，宽为2.5厘米，求操场的实际面积．
<gadget id="calculator">1 / 1_000</gadget>
<output>1/1_000 = around 0.001</output>

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

<gadget id="calculator">2.5 / (1/1_000) / 100</gadget>
<output>25</output>

<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<result>1_000</result>