There is a piece of land of 1.8 hectares, and walnuts are to be planted in this land. The distance between plants is 2.5 meters, and the distance between rows is 2 meters. Each peach tree seedling is 15 yuan. How much does it cost to buy these peach tree seedlings?
有块1.8公顷的土地，要在这块地里栽种核桃，株距为2.5米，行距为2米，每棵桃树苗15元，买这些桃树苗一共要花多少钱？
<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">10_000 / 5</gadget>
<output>2_000</output>

<gadget id="calculator">15 * 1.8 * 2_000</gadget>
<output>54_000</output>

<result>54_000</result>