A cylindrical cistern has a bottom circumference of 25.12 meters and a height of 4 meters. Put cement on the sides and bottom of the cistern. If 20 kilograms of cement is needed per square meter, how many kilograms of cement will be used in total?
一个圆柱形蓄水池，底面周长是25.12米，高是4米，将这个蓄水池的四周及底部抹上水泥，如果每平方米需要水泥20千克，一共要用水泥多少千克？
<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">25.12 * 4</gadget>
<output>100.48</output>

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

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

<result>3_014.4</result>