Fold a piece of rectangular paper in half three times and unfold it. One part is 30 square centimeters. What is the area of this rectangular paper?
把一张长方形纸对折3次后展开，其中的一份是30平方厘米，这张长方形纸的面积是多少．
<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<result>240</result>