If the base of a parallelogram is 8 decimeters and the height is 50 centimeters, what is the area in square decimeters?
一个平行四边形的底是8分米，高是50厘米，面积是多少平方分米．
<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>