Question 500723
total cost = $8.29 + $1.99
total cost = $10.98
.
total volume = 64 oz + 20 oz
total volume = 84 oz
.
The units of measure tell you how to do the rest:  you're looking for $ per oz.
So, the answer if $10.98/84 oz.
.
10.98/84 = .13
.13 = 13 cents/oz
.
Done.