A new Lexus sells for about $50,000. The function expresses the depreciation rate r for a five-year-old car as a function of the value V of a five-year-old car. What is the depreciation rate for a car...

A new Lexus sells for about $50,000. The function expresses the depreciation rate r for a five-year-old car as a function of the value V of a five-year-old car. What is the depreciation rate for a car that is worth $18,000 after five years? Write V as a function of r.