A piece of square paper has a perimeter of (4/5) meters. After folding it in half, what is the area in square decimeters?
一张正方形纸，周长是(4/5)米，把它对折以后，面积是多少平方分米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 4</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/5) * (1/5) * (1/2) * 100</gadget>
<output>2</output>

<result>2</result>