To make a cuboid iron box with a length of 5 cm, a width of 4.5 cm, and a height of 4 cm, how many square centimeters of iron sheet are needed to make 100 such cartons?
做一种长方体的铁盒，长5厘米，宽4.5厘米，高4厘米，做100个这样的纸盒至少要多少平方厘米铁皮？
<gadget id="calculator">5 * 4.5</gadget>
<output>22.5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">4.5 * 4</gadget>
<output>18</output>

<gadget id="calculator">22.5 + 20 + 18</gadget>
<output>60.5</output>

<gadget id="calculator">60.5 * 2 * 100</gadget>
<output>12_100</output>

<result>12_100</result>