There are 5 identical cylindrical wooden columns in the school corridor. The circumference of the bottom surface is 9.42 decimeters and the height is 4 meters. If these wooden columns are painted with 25 grams of paint per square meter, how many kilograms of paint are needed in total?
学校走廊有5根相同的圆柱形的木柱，底面周长是9.42分米，高是4米，给这些木柱涂油漆，如果每平方米用油漆25克，共需要多少千克的油漆？
<gadget id="calculator">9.42 / 10</gadget>
<output>0.942</output>

<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">25 * 0.942 * 4 * (1/200)</gadget>
<output>0.471</output>

<result>0.471</result>