What is the volume of a cylinder whose base area is 105 square decimeters and whose height is 40 centimeters?
一个圆柱体的底面积是105平方分米，高是40厘米，体积是多少．
<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">105 * 4</gadget>
<output>420</output>

<result>420</result>