The store asks an advertising company to make a trapezoidal billboard, the upper bottom is 4 meters long, the lower bottom is 5 meters long, and the height is 2 meters. If the advertising company costs 30 yuan per square meter to make billboards, how much will the store pay the advertising company?
商店请广告公司制作一块梯形广告牌，上底长4米，下底长5米，高2米．如果这个广告公司制作广告牌的费用为每平方米30元，那么商店要支付给这个广告公司多少元？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

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

<gadget id="calculator">9 * 1 * 30</gadget>
<output>270</output>

<result>270</result>