A cylindrical oil tank has a bottom radius of 2 meters and a height of 10 meters. The oil tank is filled with 75% oil. If the oil weighs 700 kg per cubic meter, how many tons does the oil in the oil tank weigh?
一个圆拄形油罐，它的底面半径2米，高10米，油罐注入75%的石油，如果每立方米石油重700千克，油罐里的石油重多少吨？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">700 / 1_000</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3.14 * 4 * 10 * (7/10) * (7/10)</gadget>
<output>61.544</output>

<result>61.544</result>