A warehouse store sells 4.5-ounce cans of tuna in packages of 3. A package of 3 cans costs $3.78. The store also sells 5.5-ounce cans of the same tuna in packages of 5. A package of 5 cans costs $8.25. The store sells 6.5-ounce cans in packages of 4 cans for $6.24. Which package is the best buy