1 From the distance from the center of the earth to the peak of the mountain.  As mountains are generally measured from sea level, Mount Everest 29,035 ft (8,850m) is considered to be king. However, there is a difference between the highest and tallest.
You can buy acoustic ceiling tiles in either 2'x2' or 2'x4' sizes. It will cost about $1,000-$1,700 to install an acoustic ceiling system in an average 12'x14' room. Most contractors will charge between $2 and $5 per square foot for labor. A modest set of 12, 2x2 tiles can cost from $25-$40. There are more extravagant tiles which can cost as much as $100 for a set of 12.
A contractor will charge $1,241 to install a drop ceiling in a 15-by-20-foot room using 24-inch square panels, which includes the labor and material. If you have some carpentry experience you can buy the grid and panels for $300, the drop ceiling installation cost, saving 75 percent. The job will cost more if you incorporate recessed or surface-mounted lighting. When youâre planning a ceiling in a room, figure you need at least a 7-foot ceiling height.