As a car ages, its value decreases. The value of a particular car with an original purchase price of $25,900 is modeled by the following function, where c is the value at time t , in years. c(t)=25,900(1-0.21)^t What is the value of the car when it is 4 years old? The value of the car after 4 years is $ What is the total depreciation amount after 5 years? After 5 years, the total depreciation amount is $