For a cylinder, increase its height by 1 decimeter, keep the size of its base, increase its volume by 10%, and increase its surface area by 6.28 square decimeters. What is the volume of the original cylinder in cubic decimeters?
一个圆柱，把它的高增加1分米，底面的大小不变，体积比原来增加了10%，表面积比原来多6.28平方分米．原来的圆柱的体积是多少立方分米？
<gadget id="calculator">6.28 / 1 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">3.14 * 1 * 20</gadget>
<output>62.8</output>

<result>62.8</result>