If a carpenter makes a drawer with a length of 50 cm, a width of 40 cm, and a depth of 12 cm, how many square centimeters of wood should be used at least?
木工做一个长50厘米、宽40厘米、深12厘米的抽屉，至少要用木板多少平方厘米？
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">50 * 12 * 2</gadget>
<output>1_200</output>

<gadget id="calculator">40 * 12 * 2</gadget>
<output>960</output>

<gadget id="calculator">2_000 + 1_200 + 960</gadget>
<output>4_160</output>

<result>4_160</result>