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.
1 Prices start at $20-$90 for a basic one-or two-speed ceiling fan that works off a pull chain or wall switch, usually with a straightforward design and a standardized (if unexciting) light fixture. 2  Expect to pay $200-$600 for a better-designed ceiling fan in a range of styles from Victorian to tropical to modernistic.