I'm making a 2-layer 8" round cake for a little girl's 2nd birthday. It's a structural cake so I'm charging $6 per serving = $90. Now the mom has asked for a 3rd layer - which is great - and will make the cake look that much better - but I'm not sure how much to increase the price?!
A$90 for a 2 layer cake = $45 a layer, so a price of $135 would probably work.