Question

Mia can purchase a 40 ounce jar of peanut butter for $5.20 or a 15 once jar for 2.70. how much does mia save per ounce by buying the 40- once jar?

Answer 1

Cost per ounce for the 40-ounce peanut butter is 
$5.20/40 = $0.13
cost per ounce for the 15-ounce peanut butter is 
$2.70 / 15 = $ 0.18
Mia saves 5 cents or $0.05