Clea estimates that a glass contains 250.55 ml of water. the actual amount of water in the glass is 279.48 ml. to the nearest tenth of a percent, what is the percent error in clea's estimate?

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?