A trapezoid billboard, the upper base is 4m, the lower base is 8.5m, and the height is 6.4m. If you want to decorate this billboard with 0.6kg of paint per square meter, how many kilograms of paint are needed in total?
一块梯形广告牌，上底是4m，下底是8.5m，高是6.4m．如果要油饰这块广告牌，每平方米用油漆0.6kg，共需要多少千克油漆？
<gadget id="calculator">4 + 8.5</gadget>
<output>12.5</output>

<gadget id="calculator">6.4 / 2</gadget>
<output>3.2</output>

<gadget id="calculator">12.5 * 3.2 * 0.6</gadget>
<output>24</output>

<result>24</result>