A cylindrical bucket with a bottom diameter of 4 decimeters, the height of the water in the bucket is 4 decimeters, accounting for exactly 40% of the volume of the bucket. How many liters is the volume of this bucket?
一个底面直径是4分米的圆柱形水桶，桶里的水高是4分米，恰占这个水桶容积的40%．这个水桶的容积有多少升？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 / (2/5)</gadget>
<output>10</output>

<gadget id="calculator">3.14 * 4 * 10</gadget>
<output>125.6</output>

<result>125.6</result>