The length of a rectangle is 1.2 decimeters and the width is 0.8 decimeters. What is its perimeter?
一个长方形的长是1.2分米，宽是0.8分米，它的周长是多少？
<gadget id="calculator">1.2 + 0.8</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>