A box of biscuits is 20 centimeters long, 15 centimeters wide and 30 centimeters high. Now it is necessary to stick a label paper with a height of 25 centimeters around it. What is the area of this label paper?
一盒饼干长20厘米，宽15厘米，高30厘米，现在要在它的四周贴上高为25厘米的商标纸，这张商标纸的面积是多少平方米？
<gadget id="calculator">20 * 25</gadget>
<output>500</output>

<gadget id="calculator">15 * 25</gadget>
<output>375</output>

<gadget id="calculator">500 + 375</gadget>
<output>875</output>

<gadget id="calculator">2 / 10_000</gadget>
<output>1/5_000 = around 0.0002</output>

<gadget id="calculator">875 * (1/5_000)</gadget>
<output>7/40 = around 0.175</output>

<result>7/40 = around 0.175</result>