I read an article somewhere about how to calculate how many servings you will need with a wedding cake. Now I can't find it! What is the percentage of invites sent versus how many might actually show up and/or eat cake?

Thank for your help...

Okay, I used:

"The formula for attendance is that you take the total number of people you have invited and multiply that number by .66 and multiply that number by 1.15. This formula has a 90% accuracy rate."

Any thoughts?