A cylindrical grain hoard has an inner diameter of 8 meters at the bottom and a height of 2.5 meters. If each cubic meter of rice weighs 550 kilograms, how many tons of rice can this grain hoard hold?
一个圆柱形粮囤，底面内直径为8米，高为2.5米，如果每立方米稻谷重550千克，这个粮囤能装多少吨稻谷？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">550 / 1_000</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">3.14 * 16 * 2.5 * (11/20)</gadget>
<output>69.08</output>

<result>69.08</result>