At a local grocery store a 16 ounce bottle is 3.20. what is the cost per ounce

There are several information's of immense importance already given in the question. Based on those facts the answer to the question can be easily reached. Now let us focus on the problem in hand.

Cost of a 16 ounce bottle = 3.20

Cost of 1 ounce of bottle = 3.2/16

= 32/160

= 1/5

= 0.2

So the cost of an ounce of the bottle is 0.2. I hope this is the answer you were looking for and the procedure is clear to you.