I was just wondering if anyone has any idea what size are these tiers?... I need to make a cake similar to this one and was curious if anyone had any idea on the sizes?...

Also the cake should be for 75 ppl does anyone know what sizes would serve 75 ppl in 3

thank you

No photo

sorry I totally forgot to attach a photo

the top 2 tiers look like a 6 and 8, the bottom could be a 10 or 12 its hard to say cause my screen is playing tricks on me lol

sorry missed apart of your question.

a 6, 8 and 12 would feed 80
a 6, 8 and 10 would feed 62

this is a good chart i use to figure out serving and cake sizes http://shinymetalobjects.net/cake/calculator/cakulator.cgi?pan=Square%2C+6%22&pan=Square%2C+8%22&pan=Square%2C+10%22&option=2&option=Select+Cakulator&chart=wiltonParty2Inch&chart=Select+Chart&calculate=Calculate%21&.cgifields=pan

Those tiers are more than 4" tall... they're either 6 or 8" in height. They'll serve 50% more than the chart if 6" tall (with a board in the middle at 3", sliced into 1x2x3" servings), or 100% more if 8" tall.
http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm

A 4" square serves 8 (12 for extra tall tier),
a 5" square serves 12.5 (28.75 for extra tall tier),
a 6" square serves 18 (27 for extra tall tier), and
a 7" square serves 24.50 (36.75 for extra tall tier).

Using a 4/6/8 would yield 87 servings.
Using a 5/6/7 would yield 82.50 servings.

thank you very much =) that chart is very helpful