How to price an Enterprise license?

Today, I received an inquiry for an Enterprise license of my product. It is an advance file copy/backup tool.

Each license is $39.95.

But I don’t know how to price an enterprise license. The buyer says that at least 200 users will use the product.

Can you guide me how to price and enterprise license. Till now I have only sold volume licenses and favored it. I don’t want to lose the customer just because I don’t have an enterprise license.

Is there any formula for calculating the price of an enterprise license (like per seat license etc). What would be the best approach (win-win)

Kindly guide.

I would suggest the pricing of SourceGear: