On a plan with a scale of 1:300, a teaching building is 4 cm long and 3 cm wide. How big is the actual floor space of this teaching building?
一幅比例尺为1：300的平面图上，一幢教学楼长4厘米，宽3厘米．这幢教学楼实际占地面积有多大？
<gadget id="calculator">1 / 300</gadget>
<output>1/300 = around 0.003333</output>

<gadget id="calculator">4 / (1/300) / 100</gadget>
<output>12</output>

<gadget id="calculator">3 / (1/300) / 100</gadget>
<output>9</output>

<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<result>108</result>