3-78

please awnswer :d

Can someone me with this? i’m not sure what to put for my equations.

A6 ounce bottle of dressing costs $1.56 a 14 ounce bottle costs $3.36 a 20 ounce bottle costs $5.60 which has the lowest cost per ounce

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?