Hey tree cass a 9 foot shadow at the same time that a person 6 foot tall cast a 4 foot shadow what is the height of the tree?

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?