I don't see why you would charge more. It's the same size cake, just a different shape. But I am new to this so maybe I am wrong.
Same price -- an 8 inch cake is an 8 inch cake, no matter if it's round or square.
K in the long run you would definitely charge more for a square cake than a round cake. For instance
using the Wilton cutting guide for cakes;
16" round = 100 servings
16" square = 128 servings
Do you see what I mean here?
Squares will give you more servings per than a round cake so hence you would charge more. Especially if you were using a per serving charge.
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