A piece of iron is submerged into a cubic tank filled with water. The edge length of the tank is 40 cm. After the iron block is taken out, the elevation drops by 0.8 cm. What is the volume of the iron block in cubic decimeters?
将一个铁块侵没入一个盛水的正方体水缸，水缸的棱长40厘米，将铁块取出后立面下降了0.8厘米．那么铁块的体积是多少立方分米．
<gadget id="calculator">0.8 / 1_000</gadget>
<output>0.0008</output>

<gadget id="calculator">40 * 40 * 0.0008</gadget>
<output>1.28</output>

<result>1.28</result>