There is a trapezoidal billboard, its upper base is 4 meters long, its lower base is 6.5 meters long, and its height is 2 meters. It costs 10 yuan per square meter to paint the front of the billboard. How much does it cost to paint the entire billboard? money?
有一个梯形广告牌，它的上底长4米，下底长6.5米，高为2米，在它的正面涂上广告漆，每平方米需要10元钱，涂满整个广告牌需要花费多少钱？
<gadget id="calculator">4 + 6.5</gadget>
<output>10.5</output>

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

<gadget id="calculator">10.5 * 1 * 10</gadget>
<output>105</output>

<result>105</result>