Question

Mallory is on a budget and wants to determine which cereal is a better buy. A 10-ounce box of Cereal A costs $2.70 and a 13-ounce box of Cereal B costs $3.64. The store is selling each cereal in 15 ounce boxes. Which cereal is cheaper and by how much?

Answer 1

Cereal A is cheaper by $0.15

Explanation:

Cost of a 10-ounce box of Cereal A = $2.70

So,

Cost of a 1-ounce box of Cereal A =
`(2.70)/(10)=\$0.27`

Cost of a 15-ounce box of Cereal A =
`0.27(15)=\$4.05`

Also,

Cost of a 13-ounce box of Cereal B = $3.64

So,

Cost of a 1-ounce box of Cereal B =
`(3.64)/(13)=\$0.28`

Cost of a 15-ounce box of Cereal B =
`=0.28(15)=\$4.2`

Here,

Cost of a 15-ounce box of Cereal B - Cost of a 15-ounce box of Cereal A =
`4.2-4.05=\$0.15`

Therefore,

Cereal A is cheaper by $0.15