To make a plastic drawer for a refrigerator, its length is 5.6dm, its width is 4dm, and its depth is 3.5dm. How many square decimeters of plastic board is needed to make such a drawer?
要做一个电冰箱用的塑料抽屉，它的长是5.6dm，宽是4dm，深是3.5dm．做一个这样的抽屉至少需要多少平方分米的塑料板？
<gadget id="calculator">5.6 * 4</gadget>
<output>22.4</output>

<gadget id="calculator">5.6 * 3.5</gadget>
<output>19.6</output>

<gadget id="calculator">4 * 3.5</gadget>
<output>14</output>

<gadget id="calculator">19.6 + 14</gadget>
<output>33.6</output>

<gadget id="calculator">33.6 * 2</gadget>
<output>67.2</output>

<gadget id="calculator">22.4 + 67.2</gadget>
<output>89.6</output>

<result>89.6</result>