A grocery store sells four different jars of peanut butter. Determine which is the best​ buy, based on the cost per unit.

Question

14 ounces for $1.34 18 ounces for $2.14

28 ounces for $3.30 40 ounces for $4.18

Which size jar is the best to buy

Answer 1

14 ounces for $1.34

unit price 1.34/14 = .0957/oz

18 ounces for $2.14

unit price 2.14/18 =.12/oz

28 ounces for $3.30

unit price 3.30/28 =.12/oz

40 ounces for $4.18

unit price 4.18/40 = .1045/oz

The best deal is 14 ounces for $1.34

unit price 1.34/14 = .0957/oz