There is a rectangular iron sheet with a length of 30 cm and a width of 20 cm. Cut out a small square with a side length of 2 cm from each of the four corners of the iron sheet, and then make a rectangular parallelepiped box without a cover. Find the volume of this box. 2 How many square centimeters of iron sheet was used to make this box?
有一块长方形的铁皮，长30厘米，宽20厘米，在这块铁皮的四角各剪下一个边长为2厘米的小正方形，然后制成一个无盖的长方体盒子，1求这个盒子的容积．2做这个盒子用了多少平方厘米铁皮？
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<gadget id="calculator">600 - 16</gadget>
<output>584</output>

<result>584</result>