you paid $76.70 for a meal in a restaurant. If the original bill was $65, what percent tip did you leave for your server? Please Explain!

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?