A piece of land in the shape of a parallelogram has a base of 80m and a height of 50.4m. If 960 trees are planted in this field, what is the average area of each tree?
一块形状为平行四边形的地，底是80m，高是50.4m．在这块地里栽树960棵，平均每棵树占地面积是多少平方米？
<result>40.2</result>