A cylindrical oil tank has a bottom circumference of 62.8 meters and a height of 4 meters. If each cubic meter can hold 0.7 tons of oil, how many tons of oil can this tank hold?
一个圆柱形油罐，底面周长62.8米，高4米，如果每立方米可容油0.7吨，这个油罐可装油多少吨？
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 4 * 0.7</gadget>
<output>879.2</output>

<result>879.2</result>