It is known that the diameter of circle A is 2 decimeters, which is 25% longer than that of circle B. Find the circumference of circle B?
已知：甲圆的直径是2分米，比乙圆的直径长25%，求乙圆的周长？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">2 / (5/4)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">3.14 * (8/5)</gadget>
<output>5.024</output>

<result>5.024</result>