How many square decimeters of iron sheet is needed to make an uncovered iron sheet water storage tank with a length of 12 decimeters, a width of 5 decimeters, and a height of 2 decimeters?
做一个长12分米，宽5分米，高2分米的无盖铁皮蓄水槽，最少需要多少平方分米的铁皮．
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">24 + 10</gadget>
<output>34</output>

<gadget id="calculator">34 * 2</gadget>
<output>68</output>

<gadget id="calculator">60 + 68</gadget>
<output>128</output>

<result>128</result>