A cylindrical steel with a length of 9 decimeters is cut into two sections, and the surface area increases by 100 square centimeters compared to the original one. What is the original volume of the cylindrical steel?
一根长9分米的圆柱形钢材截两段后，表面积比原来增加了100平方厘米，圆柱形钢材原来的体积是多少？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 * 9 * 10</gadget>
<output>4_500</output>

<result>4_500</result>