A cuboid food box is 20cm long, 15cm wide, and 30cm high. How many square centimeters is the area of the label paper to be pasted around the food box?
一个长方体形食品盒，长20cm，宽15cm，高30cm．要在食品盒的四周贴商标纸，商标纸的面积是多少平方厘米？
<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<gadget id="calculator">15 * 30</gadget>
<output>450</output>

<gadget id="calculator">600 + 450</gadget>
<output>1_050</output>

<gadget id="calculator">1_050 * 2</gadget>
<output>2_100</output>

<result>2_100</result>