Business Class is a paid subscription that covers the boards in your Workspace (Today, workspaces are called Teams in Trello, but we will change this to better reflect what they are).
The Business Class subscription is a per user subscription for anyone that is collaborating on those boards - however, if you add a user directly to only one board in the workspace/team, you will not be charged for them.
If you have 50 boards, you can put them all in one workspace/team, and your subscription will cover all of the boards.
If you are currently paying for Trello Gold, which only covers one person, you would cancel that and upgrade your team/workspace to Business Class.
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