Answer: Size D is the best buy.
Explanation:
Since we have given that
Size A The 7 1/5 -ounce can costs $3.49.
Unit rate would be
![3.49/ 7(1)/(5)\\\\=3.49/ (36)/(5)\\\\=3.49* (5)/(36)\\\\=\$0.48](https://img.qammunity.org/2020/formulas/mathematics/middle-school/f8hzfbapn5dq69vve8d1xakj1dgsg1c2bv.png)
Size B The 16 1/2 -ounce can costs $6.49.
Unit rate would be
![6.49/ 16(1)/(2)\\\\=6.49/ (33)/(2)\\\\=6.49* (2)/(33)\\\\=\$0.39](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4biqsu6q4cyngqoibyxkxqjq9wgrrdpsck.png)
Size C The 24 3/4 -ounce can costs $8.49.
Unit rate would be
![8.49/ 24(3)/(4)\\\\=8.49/ (99)/(4)\\\\=8.49* (4)/(99)\\\\=\$0.34](https://img.qammunity.org/2020/formulas/mathematics/middle-school/370pdo2debxuepxw5ez1smae7nd5uey5mc.png)
Size D The 30 2/3 -ounce can costs $10.99
Unit rate would be
![10.99/ 30(2)/(3)\\\\=10.99/ (92)/(3)\\\\=10.99* (3)/(92)\\\\=\$0.33](https://img.qammunity.org/2020/formulas/mathematics/middle-school/x55ccu8d3lc82dwfe7y0j86f5imkb627ih.png)
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.