There is a rectangular flower bed in the experimental primary school. The width of the flower bed is (4/5) meters, and the length is 20 times the width. What is the area of the flower bed in square meters?
实验小学有一长方形花坛，花坛的宽是(4/5)米，长是宽的20倍，花坛的面积是多少平方米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 20 * (4/5)</gadget>
<output>64/5 = around 12.8</output>

<result>64/5 = around 12.8</result>