A trapezoidal billboard has an upper base of 4 meters, a lower base of 6 meters, and a height of 2 meters. If you want to paint the front and back sides of the billboard, the paint is 12 yuan per square meter. How much is the total cost?
一块梯形广告牌上底4米，下底6米，高2米，如果要给广告牌的正反两面刷油漆，每平方米油漆12元，一共要多少元？
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">10 * 1 * 2 * 12</gadget>
<output>240</output>

<result>240</result>