The AP number is calculated only from the bandwidth without considering other factors such as attenuation and interference. Take 802.11n as an example: the measured rate of each AP.

About 100Mbps, there are 10 office areas in an office building, 40 people per office area, and customers require bandwidth per terminal.

2Mbps, all users online companion rate is calculated according to 70%, how many APs are needed for the office building?