There is a vegetable field in the shape of a trapezoid, with an upper base of 13 meters, a lower base of 17 meters, and a height of 20 meters. If 25 kilograms of cabbage is collected per square meter, how many kilograms of cabbage will be harvested in this field?
有一块菜地为梯形，上底是13米，下底17米，高是20米，如果每平方米收白菜25千克，那么这块地共收白菜多少千克？
<gadget id="calculator">13 + 17</gadget>
<output>30</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">30 * 10 * 25</gadget>
<output>7_500</output>

<result>7_500</result>