A trapezoidal wheat field has an upper base of 40 meters, a lower base of 60 meters, and a height of 25 meters. If 4 kilograms of wheat are harvested per square meter, how many kilograms of wheat can be harvested in this field?
一块梯形小麦地，上底40米，下底60米，高25米，如果每平方米收小麦4千克，这块地一共可收小麦多少千克？
<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">100 * (25/2) * 4</gadget>
<output>5_000</output>

<result>5_000</result>