If a rectangular iron plate with a length of 10 decimeters and a width of 8 decimeters is cut into the largest circle, how many percent will the area be reduced from the original?
一块长10分米、宽8分米的长方形铁板，把它割成一个最大的圆，面积要比原来减少百分之几？
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">80 - 50.24</gadget>
<output>29.76</output>

<gadget id="calculator">29.76 / 80</gadget>
<output>0.372</output>

<result>0.372</result>