There is a square experimental field with a side length of 8 meters on the campus of Rongxin Primary School. The average harvest of potatoes per square meter is 1.8 kilograms. How many kilograms of potatoes are harvested in this experimental field?
榕欣小学校园里有一块边长8米的正方形试验田，平均每平方米收土豆1.8千克，这块试验田共收土豆多少千克？
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">1.8 * 64</gadget>
<output>115.2</output>

<result>115.2</result>