A cylindrical cistern with a bottom circumference of 25.15 meters and a height of 4 meters is plastered with cement along the perimeter and bottom of the cistern. If 20 kilograms of cement is used per square meter, how many kilograms of cement are needed in total?
一个圆柱形蓄水池，底面周长25.15米，高4米，沿着这个蓄水池的四周及底部抹水泥．如果平方米用水泥20千克，一共需多少千克水泥？
<gadget id="calculator">25.12 * 4</gadget>
<output>100.48</output>

<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">100.48 + 50.24</gadget>
<output>150.72</output>

<gadget id="calculator">20 * 150.72</gadget>
<output>3_014.4</output>

<result>3_014.4</result>