A warehouse store sells 4.5​-ounce cans of tuna in packages of . A package of cans costs ​$3.78. The store also sells 3.5​-ounce cans of the same tuna in packages of 6. A package of cans costs ​$6.30. The store sells 6.5​-ounce cans in packages of 8 cans for ​$13.52. Which package is the best​ buy?