3.89 cents per ounce
Step-by-step explanation
to solve this we need to do a conversion of units,
the equivalences are

so
Step 1
find the cost in dollars
to know the cost in cents, just multiply the cost in dollars by 100
hence

Step 2
now, find the rate
the rate is given by.

now, replace

therefore, the answer is
3.89 cents per ounces
I hope this helps you