/The volume of computer parts in landfill sites is growing exponentially. In 2001, a particular landfill site had 124 000 m of computer parts, and in 2007, it had 347 000 m of parts. a) What is the doubling time of the volume of computer parts in this landfill site? b) What is the expected volume of computer parts in this landfill site in 2020? 19. The value of a particular model of car depreciates by 18% per year. This model of car sells for $35 000. a) Write an equation to relate the value of the car to the time, in years. b) Determine the value of the car after 5 years. c) How long will it take for the car to depreciate to half its original value? d) Sketch a graph of this relation. e) Describe how the shape of the graph would change if the rate of depreciation changed to 25%.