There is a trapezoidal vegetable field, the upper base is 13 meters long, the lower base is 27 meters long, and the height is 125 meters. If the income per square meter of vegetables is 3 yuan, how much is the total income of this vegetable field?
有一块梯形蔬菜地，上底长13米，下底长27米，高125米，如果每平方米蔬菜收入3元，这块菜地的总收入是多少元？
<gadget id="calculator">13 + 27</gadget>
<output>40</output>

<gadget id="calculator">125 / 2</gadget>
<output>125/2 = around 62.5</output>

<gadget id="calculator">40 * (125/2) * 3</gadget>
<output>7_500</output>

<result>7_500</result>