Building from the datacenter costs, the BBisp is paying $900 monthly for a full 42U rack1 and 1423 US Dosidoes for 20/200 Mbps internet service, for a total of 2323 USD before the 22% VAT which tacks on 511.06 USD for a grand total of 2834.06 USD monthly going to the datacenter.
The Simple Pricing Scheme
For this we take the 2323 USD figure pretax and get our weekly rate for 1U service with internet connectivity.
[12*(2323*2)]/(52*40) = 55752/2080 = 26.8 USD per Rack Unit Week
Everyone gets bolted in, everyone shares the internet pipe.
Let us start with the rack because it is easy:
[12*(900*2)]/(52*40) = 21600/2080 = 10.38 USD per Rack Unit Week
Server gets bolted in and you propose math for making whatever sort of custom connectivity option you desire work out in the forum or in the comments to this post. It gets discussed, checked for sanity, and the results of the deliberation go into the comments of this post with links to the log discussion. Thusly precedents are set, recorded, and may be consulted in the future for the next customer's convenience.