After a 4-meter-long cylindrical steel is cut into two equal sections, the surface area increases by 0.6 square decimeters. If the steel weighs 7.8 kilograms per cubic decimeter, how much does the steel weigh?
把一根长4米的圆柱形的钢材截成相等的两段以后，表面积增加了0.6平方分米，如果每立方分米钢材重7.8千克，这根钢材重多少千克？
<gadget id="calculator">0.6 / 2</gadget>
<output>0.3</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">0.3 * 40 * 7.8</gadget>
<output>93.6</output>

<result>93.6</result>