Final answer:
To determine which size of the Forever Clean Spray is a better buy, we compare the prices per ounce for each size. The 16-oz size is the better buy since we are getting 32 ounces for $1.89, which is a better price per ounce compared to the 30-oz size.
Step-by-step explanation:
To determine which size of the Forever Clean Spray is a better buy, we need to compare the prices per ounce for each size.
For the 16-oz size, the regular price is $1.89, but it is a "buy one get one free" special. So, we are essentially getting 32 ounces for $1.89.
For the 30-oz size, the regular price is $2.19, but it is 25% off. So, the discounted price is $2.19 - 25% = $1.64 per 30 ounces.
Therefore, the 16-oz size is the better buy since we are getting 32 ounces for $1.89, which is a better price per ounce compared to $1.64 for 30 ounces.