The perimeter of a square mirror is 64 decimeters. The price of this mirror is 2 yuan per square decimeter. How much does it cost to buy this mirror?
一面正方形镜子的周长是64分米，这种镜子的价格是每平方分米2元，买这面镜子需要多少钱？
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<gadget id="calculator">16 * 16 * 2</gadget>
<output>512</output>

<result>512</result>