Question

One dozen eggs were purchased for $.89 how much do 4 eggs cost?

Answer 1

There are 12 eggs in one dozen. 
Set up an equation
12eggs/0.89 = 4eggs/x
cross multiply and solve for x

or

just divide 0.89 by 3 because 4 eggs * 3 eggs = 12 eggs.

Answer 2

I believe the answer is 29.67 (if I calculated correctly). However, it can easily round to $.30