Use a scale of 1:400 to draw a rectangular lawn with a length of 50 meters and a width of 30 meters on the drawing. What is the area of the lawn in the picture in square centimeters?
用1：400的比例尺将长50米、宽30米的长方形草坪画在图纸上，图上草坪的面积是多少平方厘米？
<gadget id="calculator">1 / 400</gadget>
<output>1/400 = around 0.0025</output>

<gadget id="calculator">50 * 100 * (1/400) * 30 * 100 * (1/400)</gadget>
<output>375/4 = around 93.75</output>

<result>375/4 = around 93.75</result>