The third programming project involves writing a program that produces a road trip cost

estimator with a GUI interface. The required GUI is shown below:

The text fields above the Calculate button are the input fields and the one below is the output

field. The output field should not be editable. Three of the input fields have combo boxes to their

right, which allow the data to be input as described below:

The distance can be entered in either miles or kilometers

The gasoline cost can be input in either dollars per gallon or dollars per liter

The gas mileage can be input as either miles per gallon or kilometers per liter

The necessary calculations are as follows;

gasoline cost $-=\frac{distance}{\text{g}\text{a}\text{s}\text{m}\text{i}\text{l}\text{a}\text{g}\text{e}}$ gasoline cost

total trip cost $=$ gasoline cost $+($ hotel cost $+$ food cost $)$ number $of$ days $+$ attractions

Your program should consist of two classes. The first class Project$3$ should define the GUI

illustrated above. The second class TripCost should be an immutable class that has at a

minimum a constructor that creates a trip cost object and a method that computes and returns the

total trip cost.