To make a cuboid frame with a length of 12 cm, a width of 10 cm, and a height of 8 cm, how many cm of iron wire are needed?
要做一个长12cm，宽10cm，高8cm的长方体框架，需多少cm的铁丝．
<gadget id="calculator">30 * 8</gadget>
<output>240</output>

<result>240</result>