ANSWER MY QUESTION I WILL GIVE YOU A BRAINLIEST

Mickey used these calculations to find how much he would spend on 7 cartons of eggs, if 12 cartons of eggs cost $22.20. Describe his error.

12 cartons(÷22.20) $22.22(÷22.20)

Unit price = $0.54 $0.54(7) = $3.78