A university campus has a class B network address and wants to create 90 Local Area Networks (LANs) with 250 hosts in each LAN. It is also estimated that the number of LANs will grow at the rate of 2.5% each year for the next 4 years. Furthermore, the number of hosts per LAN will also grow by 4.5% each year for the next 4 years.
Calculate the estimated total number of LANs and the number of hosts in each LAN after 4 years from the given growth rate above.

As a system administrator, you are asked by the university to design an appropriate subnet mask, which will still be usable in 4 years given the growth rate shown above. Where applicable, your solution must be biased towards growth in LANs rather than hosts.

From the subnet mask that you have determined, answer the following questions:
● How many bits will be used for host ID?
● What is the maximum number of IP addresses that can be assigned to devices in each subnet?