There are 6 columns in the hall, each column has a base radius of 4 decimeters and a height of 5 meters. If the painting fee is 0.5 yuan per square meter, how much is the total painting fee for these 6 columns?
大厅里有6根圆柱，每根柱子的底面半径是4分米，高5米，如果每平方米需要油漆费0.5元，漆这6根柱子，一共需用油漆费多少元？
<gadget id="calculator">3.14 * 0.4 * 2 * 5 * 6</gadget>
<output>75.36</output>

<gadget id="calculator">0.5 * 75.36</gadget>
<output>37.68</output>

<result>37.68</result>