After sawing a cylindrical piece of wood with a length of 5 decimeters into two pieces along the direction parallel to the bottom surface, the surface area increases by 200 square decimeters. What is the volume of this piece of wood in cubic centimeters?
把一根长5分米的圆柱形木料沿着与底面平行的方向锯成两段后，表面积增加了200平方分米，这根木料的体积是多少立方分．
<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<gadget id="calculator">100 * 5</gadget>
<output>500</output>

<result>500</result>