Make a rectangular parallelepiped frame with 400 cm iron wire, and then pack it into a box. The ratio of length, width and height is 5:3:2. What is the surface area of this rectangular parallelepiped?
用400厘米的铁丝做一个长方体框架，再包装成盒子，长宽高的比是5：3：2，这个长方体的表面积是多少？
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">5 + 3 + 2</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">100 * (3/10)</gadget>
<output>30</output>

<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * (1/5)</gadget>
<output>20</output>

<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">1_500 + 1_000 + 600</gadget>
<output>3_100</output>

<gadget id="calculator">3_100 * 2</gadget>
<output>6_200</output>

<result>6_200</result>