A piece of square steel is 2 meters long and its cross-section is a square with a side length of 4 cm. It is known that 1 cubic centimeter of steel weighs 7.8 grams, how many kilograms does this square steel weigh?
一根方钢长2米，它的截面是一个边长4厘米的正方形．已知1立方厘米钢重7.8克，这根方钢重多少千克．
<gadget id="calculator">7.8 / 1_000</gadget>
<output>0.0078</output>

<gadget id="calculator">4 * 4 * 2 * 100 * 0.0078</gadget>
<output>24.96</output>

<result>24.96</result>