What is the value of the expression shown below? 6 + (9 − 1) 2 ÷ 4 ⋅ 1 over 2 whole to the power of 4 7 9 18 22

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?