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It's very difficult to say as it all depends on how much traffic you have.

I can tell you that 50MB couldn't run anything more than a static site and is ridiculously low. The app pool for our main webwiz.net domain which doesn't use a database and just static ASP pages is presently using 63MB after 12 hours.

It also depends on the type of database you use, if you use Access the database needs to load into memory (app pool) so often uses more memory.

This forum running on SQL Server is using 146MB after 12 hours with an average of 50 active users, yet the demo forum on Access which gets very few hits is using 189MB after the same amount of time.

As a rule if you get a web host who give you your own app pool then don't use them unless they give you at least 200MB, otherwise you are stuck to only running static pages. It's a rather sneaky way some web hosts use to advertise huge bandwidth and database diskspace allowances and then slap you with a 50MB memory limit so you can not use the advertised resources and best stayed clear of.