Abby can buy an 8-pound bag of dog food for $740 or a 4-pound bag of the same dog food for $5.38. Which is the better buy?

Question

Hazel Anglin · Accepted Answer

I am not sure about the numbers in particular the prices!...but...

To determine the cost of a unit amount of dog food, we can divide the price by the quantity. Then, we can determine which option is more appealing to Abby. In the first case one pound of dog food will cost: #740/8=$92.5# in the second case the price is quite low....buying two bags, to get #8# pounds of dog food, she will pay #2×5.38=$10.76# !!! The prices, in my opinion, are incorrect.

Kennedy Adams · Answer

undefined To determine the better buy, we need to calculate the price per pound for each option.

For the 8-pound bag:
Price per pound = Total price / Total pounds
Price per pound = $740 / 8 pounds

For the 4-pound bag:
Price per pound = Total price / Total pounds
Price per pound = $5.38 / 4 pounds

Comparing the two prices per pound will tell us which option is the better buy.