A trapezoidal wheat field has an upper base of 42 meters, a lower base of 58 meters, and a height of 50 meters. The average yield of wheat per square meter is 500 grams. How many kilograms of wheat can this land produce?
一块梯形麦地，上底是42米，下底是58米，高为50米，平均每平方米产小麦500克，这块地共产小麦多少千克？
<gadget id="calculator">42 + 58</gadget>
<output>100</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">100 * 25</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 * 0.5</gadget>
<output>1_250</output>

<result>1_250</result>