Rapeseed is planted in a parallelogram field with a base of 800 meters and a height of 250 meters. Every 20 rapeseeds occupy an area of 10 square meters. It is estimated that each rapeseed will harvest 120 grams of rapeseed. How many tons of rapeseed can be harvested in this field?
在一块底是800米，高是250米的平行四边形地里种油菜，每20棵油菜占地10平方米，估计每棵油菜收菜籽120克，这块地共可收菜籽多少吨．
<gadget id="calculator">250 / 10</gadget>
<output>25</output>

<gadget id="calculator">120 / 1_000_000</gadget>
<output>3/25_000 = around 0.00012</output>

<gadget id="calculator">800 * 25 * 20 * (3/25_000)</gadget>
<output>48</output>

<result>48</result>