One dozen eggs were purchased for $0.89. how much do three eggs cost

One dozen eggs = twelve eggs

First, find how much an egg costs
cost an egg = cost of twelve eggs / 12
cost an egg = 0.89/12
you don't need to calculate this, just keep it as fraction

Second, find how much three eggs cost
cost three eggs = 3 × cost an egg
cost three eggs = 3 ×
cost three eggs =
cost three eggs = 0.225
To the nearest hundredth
cost three eggs = 0.23
The cost of three eggs is $0.23