Paint the inside and outside of an uncovered tin bucket with a ridge length of 20 decimeters. If 0.2 kilograms of paint is needed per square meter, how many kilograms of paint will be needed to paint the tin bucket?
给一个棱长为20分米的无盖铁皮桶内外刷漆，如果每平方米需要油漆0.2千克，油漆完这个铁皮桶需要多少千克油漆？
<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">20 * 20 * 5 * (1/50) * 0.2</gadget>
<output>8</output>

<result>8</result>