What is the perimeter of a square steel plate with a side length of 25 decimeters?
一块正方形钢板，边长25分米，周长为多少米．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

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

<result>10</result>