I expect the value of my car to depreciate over the next few years at a constant rate proportional to its current value. a. Model this as a differential equation clearly stating the variables and units of measurements used. Write down the solution to your differential equation. [2] b. When I bought my car brand new it was 23,500 but when I had it valued a few years ago, exactly two and a half years after I bought it, it was 19,200. If it's now six year since I bought the car, what is its value? [4]