SOLUTION: a bakery sells single-layer mini-cakes that are 3 inches in diameter for $4 each. They also have a cake with a 9-inch diameter for $15. If both cakes are the same thickness, which

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Question 879091: a bakery sells single-layer mini-cakes that are 3 inches in diameter for $4 each. They also have a cake with a 9-inch diameter for $15. If both cakes are the same thickness, which option gives you more cake for your money, nine mini-cakes or one 9-inch cake?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Compare their areas and prices.

Small cake, pi%2A%283%2F2%29%5E2 for $4.
Big cake, pi%2A%289%2F2%29%5E2 for $15.
Area per dollar for each cake?