Answer:
or 
Step-by-step explanation:
Convert the mixed numbers into improper fractions.

Since the two fractions have the same denominator, just subtract the numerators.

If required, rewrite the fraction in simplest form.

I believe you would multiply it by 2 and add on the multiples after you .
What you would do to get your answer is simply divide $3.60 by the # of ounces.
So this is what your problem should look like 3.60 / 24 = 0.15 or 15 cents a ounce.