Guangming Village planted trees in a rectangular field 120 meters long and 80 meters wide. The distance between rows is 8 decimeters, and the distance between plants is 4 decimeters. How many trees are planted in this land?
光明村在一块长120米，宽80米的长方形地里种树．其中行距是8分米，株距4分米，这块地种树多少棵？
<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) * (2/5)</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">80 / (8/25)</gadget>
<output>250</output>

<gadget id="calculator">120 * 250</gadget>
<output>30_000</output>

<result>30_000</result>