Xiaoxiao cut out a triangle with a base of 0.4 decimeters and a height of 0.5 decimeters on a piece of rectangular paper with a length of 1.2 decimeters and a width of 0.8 decimeters. What is the remaining area?
笑笑在一张长1.2分米，宽0.8分米的长方形纸上，剪下一个底是0.4分米，高是0.5分米的三角形，剩下的面积是多少平方分米？
<gadget id="calculator">1.2 * 0.8</gadget>
<output>0.96</output>

<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">0.4 * 0.25</gadget>
<output>0.1</output>

<gadget id="calculator">0.96 - 0.1</gadget>
<output>0.86</output>

<result>0.86</result>