Answer: Amount spent on 7 cartons of eggs is $12.95.
Step-by-step explanation:
Since we have given that
Number of cartons of eggs = 12
Cost of 12 cartons of eggs = $22.20
So, Unit price of carton of eggs would be

Now, number of cartons of eggs = 7
Amount spent on 7 cartons of eggs is given by

So, 12 cartons(÷22.20), there is a mistake as it should be 22.20÷12.
Hence, Amount spent on 7 cartons of eggs is $12.95.