Final answer:
To determine which is the better buy, calculate the cost per ounce by dividing the cost by the number of ounces. Option A is the better buy at $0.05 per ounce compared to Option B at $0.06 per ounce.
Step-by-step explanation:
To determine which size is the better buy for dish soap, you need to calculate the cost per ounce for each option. To do this, divide the cost of each option by the number of ounces.
- For option A, 18 oz. for $0.90, the cost per ounce is $0.90 ÷ 18 oz. = $0.05 per ounce.
- For option B, 24 oz. for $1.44, the cost per ounce is $1.44 ÷ 24 oz. = $0.06 per ounce.
Since the cost per ounce is lower for option A, it is the better buy.
When estimating the cost for different sizes of laundry detergent, you'll similarly calculate the cost per ounce and then multiply by the size of the package you are interested in. For instance:
- If the estimated cost per ounce is known for a detergent, and you want to find the cost for a 40 oz. size, you'd multiply the cost per ounce by 40.
- If the same detergent were sold in a 90 oz. size, you would multiply the cost per ounce by 90 for the estimated cost.