trapezoidal vegetable field is 300 meters long at the top, 1200 meters long at the bottom, and about 60 meters high. If you grow wheat in this field, you can harvest 550 kilograms of wheat per hectare on average. How many kilograms of wheat can you harvest in total?
一块梯形的菜地，上底长300米，下底长1200米，高约为60米，在这块地里种小麦，平均每公顷可收小麦550千克，这块地共收割小麦多少千克？
<gadget id="calculator">300 + 1_200</gadget>
<output>1_500</output>

<gadget id="calculator">60 / 2 / 10_000</gadget>
<output>3/1_000 = around 0.003</output>

<gadget id="calculator">550 * 1_500 * (3/1_000)</gadget>
<output>2_475</output>

<result>2_475</result>