The upper base of a trapezoidal paddy field is 80 meters, 40 meters shorter than the lower base, and 95 meters high. This year, a total of 4,560 kilograms of rice was harvested. How many kilograms of rice are harvested per hectare on average?
一块梯形水田的上底是80米，比下底短40米，高是95米，今年共收稻谷4560千克，平均每公顷收稻谷多少千克？
<gadget id="calculator">80 + 40 + 80</gadget>
<output>200</output>

<gadget id="calculator">95 / 2 / 10_000</gadget>
<output>19/4_000 = around 0.00475</output>

<gadget id="calculator">200 * (19/4_000)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">4_560 / (19/20)</gadget>
<output>4_800</output>

<result>4_800</result>