A parallelogram with an area of 10m**2, if the base and height are doubled, what is its area in m**2?
一个平行四边形，面积是10m**2，若底和高都扩大2倍，它的面积是多少m**2．
<gadget id="calculator">10 * 2 * 2</gadget>
<output>40</output>

<result>40</result>