A square vegetable field has a side length of 400 meters. If its side length is reduced to one thousandth of its original size, what is the perimeter of the reduced figure?
一块正方形的菜地边长是400米，把它的边长缩小到原来的千分之一，缩小后的图形周长是多少？
<gadget id="calculator">400 / 1_000</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 4</gadget>
<output>8/5 = around 1.6</output>

<result>8/5 = around 1.6</result>