parallelogram plank has a base of 6.2 decimeters and a height twice that of the base. What is its area in square decimeters?
一块平行四边形木板，底6.2分米，高是底的2倍．它的面积是多少平方分米？
<gadget id="calculator">6.2 * 2</gadget>
<output>12.4</output>

<gadget id="calculator">6.2 * 12.4</gadget>
<output>76.88</output>

<result>76.88</result>