Two wheels rolled simultaneously. the radius of the smaller wheel is r feet and the radius of the larger wheel is 2r feet if both wheels did a total of 4 rotations, how much farther did the larger wheel travel?

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?