There is a trapezoidal vegetable field, the upper base is 13 meters long, the lower base is 27 meters long, and the height is 12.5 meters. If the income per square meter of vegetables is 3.2 yuan, how much is the total income of this vegetable field?
有一块梯形菜地，上底长13米，下底长27米，高12.5米，如果每平方米蔬菜收入3.2元，这块菜地总收入是多少元？
<gadget id="calculator">13 + 27</gadget>
<output>40</output>

<gadget id="calculator">12.5 / 2</gadget>
<output>6.25</output>

<gadget id="calculator">40 * 6.25</gadget>
<output>250</output>

<gadget id="calculator">3.2 * 250</gadget>
<output>800</output>

<result>800</result>