The surface area of a cuboid is 580dm**2, the base area is 50dm**2, and the perimeter of the base is 30dm. Find the volume of the cuboid.
一个长方体的表面积是580dm**2，底面积是50dm**2，底面周长30dm，求这个长方体的体积．
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">580 - 100</gadget>
<output>480</output>

<gadget id="calculator">480 / 30</gadget>
<output>16</output>

<gadget id="calculator">50 * 16</gadget>
<output>800</output>

<result>800</result>