Jackie is considering buying a 2014 Tesla Model S costing $69,900 and finds that the retaining values of the vehicle over the next six years are as follows:
Percent of the total value retained after 36 months: 45%
Percent of the total value retained after 72 months: 29%
If her interest rate is 7% compounded annually, what is the ownership cost of the vehicle over 3 years? Six years?