The price of milk has been steadily increasing 5% per year. if the cost of a gallon is now $3.89: what will it cost in 10 years? what did it cost 5 years ago?

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.