The length, width, and height of a paper bag are 25cm, 10cm, and 35cm respectively. To make 20 such paper bags, what is the minimum area of paper needed?
一个纸袋的长、宽、高分别是25cm、10cm、35cm，要做这样的纸袋20个，至少需要多大面积的纸？
<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<gadget id="calculator">25 * 35</gadget>
<output>875</output>

<gadget id="calculator">10 * 35</gadget>
<output>350</output>

<gadget id="calculator">250 + 875 + 350</gadget>
<output>1_475</output>

<gadget id="calculator">1_475 * 2</gadget>
<output>2_950</output>

<gadget id="calculator">2_950 - 250</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 * 20</gadget>
<output>54_000</output>

<result>54_000</result>