A trapezoidal land, the upper base is 350 meters long, the lower base is 450 meters long, and the height is 300 meters. In this field, 44.4 tons of rapeseed can be harvested. How many tons of rapeseed can be harvested on average per hectare?
一块梯形地，上底长350米，下底长450米，高300米．在这块地里可以收油菜籽44.4吨，平均每公顷收油菜籽多少吨？
<gadget id="calculator">350 + 450</gadget>
<output>800</output>

<gadget id="calculator">300 / 2 / 10_000</gadget>
<output>3/200 = around 0.015</output>

<gadget id="calculator">800 * (3/200)</gadget>
<output>12</output>

<gadget id="calculator">44.4 / 12</gadget>
<output>3.7</output>

<result>3.7</result>