If the perimeter of a rectangle is 72 cm and its width is 20% less than its length, what is the area of the rectangle in square centimeters?
一个长方形的周长是72厘米，它的宽比长少20%，这个长方形的面积是多少平方厘米．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">72 / 2 / 9</gadget>
<output>4</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<result>320</result>