Final answer:
The unit rate is $0.89 per pound when 15 pounds cost $13.35. The cost for any other quantity can be found by multiplying the unit rate by the desired number of pounds.
Step-by-step explanation:
To find the unit rate, which is the cost per pound in this case, you would divide the total cost by the number of pounds. The question states that 15 pounds of an item cost $13.35. Therefore, the unit rate is calculated as $13.35 divided by 15 lb, which equals $0.89 per pound.
The cost is already given as $13.35 for the 15-pound quantity. If you need to find the cost for a different quantity, you can multiply the unit rate by that quantity. For example, if you need to know the cost of 1 pound, it would be $0.89, while the cost for 5 pounds would be 5 multiplied by $0.89, which equals $4.45.