During the next Tree Plantation Week, DBBL is considering planting trees in one of its rectangular piece of land which is 90 feet long and 66 feet wide. The land is surrounded by boundary wall of 5 feet height. It has been decided that trees will be planted leaving 5 feet land free from the wall in all four sides. It was also decided that the distance from one tree to another in both row and column will be 4 feet. What is the maximum number of trees that can be planted in the land?

(Geometry-Rectangle)