Question

Hannaford sells two sizes of cheerios cereal. The smaller box contains 9 ounces and

costs $2.50. The larger box contains 20 ounces and and costs 3.79. What is the
difference in cost in dollars per ounce between the two sizes?

Answer 1

Quantity of cheerios cereal in the smaller box Hannaford sold = 9 ounces

Cost of nine ounces of cheerios cereal = $2.50

Cost of one ounce of cheerios cereal :

`= 2.50 \: / \: 9`

`=\color{plum}\$ 0.27`

Cost of one ounce of cheerios cereal in the smaller box = $0.27

Quantity of cheerios cereal in the larger box Hannaford sold = 20 ounces

Cost of nine ounces of cheerios cereal = $3.79

Cost of one ounce of cheerios cereal :

`= 3.79 / 20`

`=\color{plum} \$0.18`

Cost of one ounce of cheerios cereal in the larger box = $0.18

Difference in their cost per ounce :

`= 0.27 - 0.18`

`=\color{plum}\bold{\$ 0.09}`

Therefore, the difference in cost in dollars per ounce between the two sizes = $0.09