How to compare fairly

Unit price = total price ÷ quantity. A $4.50 pack of 12 eggs costs 37.5¢/egg; a $9 pack of 30 costs 30¢/egg — the bigger pack wins even though it costs more overall. Watch for different units: convert ounces↔grams (1 oz = 28.35 g) and fl oz↔ml before comparing.