A tree farm harvests a variety of trees that are sold to garden centres. In $205,$ the company was created and they acquired $1,640$ immature blue spruce trees and $328$ mature blue spruce trees. Each spruce is grown to be $8$ feet, at which point they are sold to a garden centre. The cost to sell each tree, no matter the size, is estimated at $$25.$

The company uses a periodic system to account for the sale of trees. The trees sold each year is included below along with the following information.

$\backslash$table$[[,1$ January $205,31$ December $205,31$ December $206$