Use the simple interest formula to find the ending balance

$5000 at 5% for 3.5 years

round your answer to to the nearest cent

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?