Embroider lace around a square handkerchief with a side length of 25 cm. What is the length of the lace in decimeters?
在一块边长25厘米的正方形手帕四周绣上花边，花边的长是多少分米．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<result>10</result>