Answer:
Second package costs the lowest.
Step-by-step explanation:
A ware house sells tuna cans weighing = 5.5 ounce
It sells the cans of tuna in the package of 6.
Weight of 6 cans = 5.5×6 ounce
Cost of the 6 cans = $9.24
Therefore, cost of 1 tuna can =
per oz
Now weight of second type of tuna can = 6.5 ounce
Weight of 3 cans = 3×6.5 = 19.5 ounce
Cost of 3 tuna cans = $4.68
Cost of 1 tuna can = 
= $0.24 per oz.
Similarly cost of third type of tuna can = 
= $0.32 per oz
Second package has the lowest cost per ounce of tuna.