A billboard (the same content is produced on both sides), the upper bottom is 4 meters, the lower bottom is 6 meters, and the height is 2 meters. If the advertising company charges 20 yuan per square meter for the billboard, how much will the billboard cost?
一块广告牌(两面都制作同样的内容)，上底4米，下底6米，高2米，如果这个广告公司广告牌每制作平方米收费20元，那么这块广告牌要多少费用？
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

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

<gadget id="calculator">10 * 1 * 20</gadget>
<output>200</output>

<result>200</result>