The lower base of a trapezoid is twice the upper base, and the upper base is extended by 4 cm to become a parallelogram with an area of 96 square centimeters. How many square centimeters is the area increased?
一个梯形的下底是上底的2倍，把上底延长4cm，恰好变成一个面积是96平方厘米的平行四边形，面积增加了多少平方厘米？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">96 / 8</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<result>24</result>