Using the rule of 72, t = StartFraction 72 Over r EndFraction, how long will it take for the principal to double with an annual compound interest rate of 6%?

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.