If the height of a cylinder increases by 2 decimeters, the volume ratio increases (1/10) and the surface area increases by 6.28 square decimeters compared to the original one. What is the original volume of the cylinder?
一个圆柱体，若高增加2分米，体积比原来增加(1/10)，且表面积比原来增加6.28平方分米，原来圆柱的体积是立方分米？
<gadget id="calculator">6.28 / 2 / 3.14 / 2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / (1/10)</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 0.25 * 20</gadget>
<output>15.7</output>

<result>15.7</result>