Stemps,
According to Wilton's Party Cake Guide a two layer 8 in will serve 12 and a 6in will serve 8. So, you'd have 20 -1 1/2 X 2inch pieces. In my opinion, those are small servings, so I like to figure that I'm going to get a little less out of it. A 9 inch round will serve 22. Then you could put your 6in on top and have 30pieces -again according to Wilton's guide - which would give you enough to feed 25.
Does that make sense ?
Hope I didn't confuse you!!
Amy
i always second guess myself on the serving sizes too
One word of advice: however you decide to calculate your slice size & count, make sure your customer knows what size pieces your calculation is based on. If the headcount increases, you can always use a 10" & 6" for a total of 40 1" x 2" slices. In which case make sure your customer knows how to cut the 10" cake. Generally speaking, if there will be a meal served, a 1x2" slice is big enough. If the only cake & ice cream will be served, the slices will need to be a bit bigger.
Good luck!
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