There is a trapezoidal billboard, the upper base is 4 meters, the lower base is 6 meters, and the height is 5 meters. It costs 250 yuan per square meter to manufacture this billboard. How much does this billboard cost in total?
有一块梯形的广告牌，上底是4米，下底是6米，高是5米．制造这块广告牌，每平方米需要250元，这块广告牌一共需要多少元？
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">10 * (5/2) * 250</gadget>
<output>6_250</output>

<result>6_250</result>