The scale of a picture is 1:200. The length of the house in the picture is 4 cm, and the width is 3 cm. What is the actual area of this house in square meters?
一张图的比例尺是1：200．在图上房子的长是4厘米，宽是3厘米，这间房子的实际面积是多少平方米？
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">4 / (1/200) / 100</gadget>
<output>8</output>

<gadget id="calculator">3 / (1/200) / 100</gadget>
<output>6</output>

<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<result>48</result>