Cut out a circle with the largest area on a piece of rectangular paper with a length of 5 cm and a width of 4 cm. What percentage of the area of the remaining part accounts for the area of the rectangular paper?
在一张长5厘米、宽4厘米的长方形纸上剪下一个面积最大的圆，剩余部分面积占长方形纸面积的百分之几？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">20 - 12.56</gadget>
<output>7.44</output>

<gadget id="calculator">7.44 / 20</gadget>
<output>0.372</output>

<result>0.372</result>