Uncle Li uses a 12.4m long fence to form a rectangular pigsty with a width of 2.4m and the largest pigsty. What is the maximum area of this pigsty in m**2.
李大爷用12.4m长的篱笆靠一面墙围成一个宽2.4m的长方形最大猪圈，这个猪圈最大面积是多少m**2．
<gadget id="calculator">2.4 * 2</gadget>
<output>4.8</output>

<gadget id="calculator">12.4 - 4.8</gadget>
<output>7.6</output>

<gadget id="calculator">7.6 * 2.4</gadget>
<output>18.24</output>

<result>18.24</result>