Answer:
128 divided by $4.59 = 27.88671023965142
64 divided by $329 = 0.19452887537994
32 divided by $1.99 = 16.08040201005025
Therefore, the size which has lowest price per fluid ounce is 32 fl. oz container .
You're just suppose to divide the fluid oz and the cost for all the sizes,which ever has the lowest price is the answer.