Kendra spent $1.20 for 4 pieces of gum. Taliyah bought a 20-pack of gum for $6.60. Jamil spent his last dollar on 5 pieces of gum. Fredrick's friend charged him $0.25 for one piece of gum. Whose gum is the cheapest?

Jamil's gum were the cheapest ($.20).

Step-by-step explanation:

Kendra's Ratio: $1.20/4

- Kendra's cost per gum is $.30

Taliyah's Ratio: $6.60/20

- Taliyah's cost per gum is $.33

Jamil's Ratio: $1/5

- Jamil's cost per gum is $.20

Fredrick's Ratio: $.25/1

- Fredrick's cost per gum is $.25