If an iron cone is submerged in a cylindrical measuring cup with a bottom area of 30 decimeters, the height of the water rises by 2 decimeters. If iron weighs 7.8 kilograms per cubic decimeter, how much does the iron cone weigh?
把一个铁圆锥浸没在底面积是30平方分米的圆柱形量杯水中，水的高度上升了2分米，如果每立方分米铁重7.8千克，这个铁圆锥重多少千克？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">7.8 * 60</gadget>
<output>468</output>

<result>468</result>