A rectangle with a length of 8 decimeters and a width of 4 decimeters is cut off from each of the four corners. Find the perimeter of the remaining figure in meters.
一个长8分米，宽4分米的长方形，分别从四个角上剪去一个正方形．求剩余图形的周长是多少米．
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12 * (1/5)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>