An equation for the depreciation of a car is given by y is equal to cap A times open paren 1 minus r close paren to the t th power , where y is equal to current value of the car, cap A is equal to original cost, r is equal to rate of depreciation, and t is equal to time, in years. The current value of a car is 12 dollars comma 282 point 5 0 The car originally cost 20 dollars comma 000 and depreciates at a rate of 15 percent per year. How old is the car?