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