Write a Class named IPhone to accompany the financial class case study from chapter $9$ of our BJP text. Your IPhone Class shall implement the Asset Interface, and meets the following specifications:

A$.$ Three data fields $($no more$)$:

public static final double ANNUAL$\_$DEPRECIATION $=0\mathrm{.}2$; $//$ fraction decline each year

private double originalCost; $//$ in US dollars, fixed for each object

private int currentAge; $//$ in years

B$.$ Two constructors: IPhone$($originalCost$,$ currentAge$)$ and a zero parameter constructor that calls this$(0,0)$:

C$.$ Methods required by Asset Interface:

market value that depreciates each year by amount given by ANNUAL$\_$DEPRECIATION

profit that is market value minus original cost.

D$.$ toString$()$ method to allow printing an object similar to $($example below$)$:

"IPhone $(5$ years old $)"$