at top speed one of the fastest elevators in the world travels 45 miles per hour. The equations y=45x could be used to find the miles y traveled in x hours. what is the constant of proportionality

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.