Grandpa Li has reclaimed a trapezoidal vegetable field, the upper base is 15 meters, the lower base is 40 meters, and the height is 18 meters. If the income per square meter is 48.5 yuan, how much can this land earn?
李爷爷开垦了一块梯形菜地，上底是15米，下底是40米，高是18米，如果每平方米可收入48.5元，这块地可收入多少元？
<gadget id="calculator">15 + 40</gadget>
<output>55</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">55 * 9 * 48.5</gadget>
<output>24_007.5</output>

<result>24_007.5</result>