Use a rectangular bamboo fence with a length of 12.96 meters and a width of 2 meters to form a cylindrical grain storage. How many tons of millet are stored in the store?
用一块长12.96米，宽2米的长方形竹篱围成一个圆柱形粮囤，接口处是0.4米，粮囤内有谷子占容积的75%，又知每立方米谷子约重1100千克，粮囤装有谷子多少吨？
<gadget id="calculator">12.96 - 0.4</gadget>
<output>12.56</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 6.28</gadget>
<output>2</output>

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

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_100 / 1_000</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">3.14 * 4 * 2 * (3/4) * (11/10)</gadget>
<output>20.724</output>

<result>20.724</result>