ANSWER
[tex]1 \frac{11}{16} ounces[/tex]
EXPLANATION
It was given that,a bottle of la belle bœuf contains 3/8 ounces of perfume.
We want to find how many ounces of perfume would 4 1/2 bottles contain.
If 1 bottle contains 3/8 ounces;
Then 4½ bottles should contain more ounces.
If more less divides.
4½ bottles contain
[tex] \frac{4 \frac{1}{2} \times \frac{3}{8} }{1} [/tex]
[tex] = \frac{27}{16} [/tex]
=1.6875 ounces.
