If the consumption function is given by C = 150 + 0.85Y and Y increases by 1 unit, then C increases by: 0.15 units. 0.85 units. 0.5 units. 1 unit.

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?