An equation for the depreciation of a car is given by y=A(1-r)^ prime where y = current value of the car, A = original cost r = rale of depreciationand t = time , in years. The value of a car is half what it originally cost. The rate of depreciation is 10% Approximately how old is the car?

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.