George invited 65 students in his school to volunteer at a charity race. 39 of the students signed up to volunteer. what percent of the invited students signed up? [type your answer as a number.]

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?