On a plan with a scale of (1/200), the length of a house is measured to be 4 cm. What is the actual length in meters?
在比例尺是(1/200)的平面图上，量得一间房屋长4厘米，实际长度是多少米．
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">4 / (1/200)</gadget>
<output>800</output>

<gadget id="calculator">800 / 100</gadget>
<output>8</output>

<result>8</result>