Answer: Size D is the best buy.
Step-by-step explanation:
Since we have given that
Size A The 7 1/5 -ounce can costs $3.49.
Unit rate would be
[tex]3.49\div 7\dfrac{1}{5}\\\\=3.49\div \dfrac{36}{5}\\\\=3.49\times \dfrac{5}{36}\\\\=\$0.48[/tex]
Size B The 16 1/2 -ounce can costs $6.49.
Unit rate would be
[tex]6.49\div 16\dfrac{1}{2}\\\\=6.49\div \dfrac{33}{2}\\\\=6.49\times \dfrac{2}{33}\\\\=\$0.39[/tex]
Size C The 24 3/4 -ounce can costs $8.49.
Unit rate would be
[tex]8.49\div 24\dfrac{3}{4}\\\\=8.49\div \dfrac{99}{4}\\\\=8.49\times \dfrac{4}{99}\\\\=\$0.34[/tex]
Size D The 30 2/3 -ounce can costs $10.99
Unit rate would be
[tex]10.99\div 30\dfrac{2}{3}\\\\=10.99\div \dfrac{92}{3}\\\\=10.99\times \dfrac{3}{92}\\\\=\$0.33[/tex]
since all the unit rates are less than 1 dollar.
so, Size Unit rate
A 0
B 0
C 0
D 0
Hence, Size D is the best buy.
