C$++10\mathrm{.}9$Write a program named SalespersonDemo that instantiates objects using classes named RealEstateSalesperson and GirlScout. Create an interface ISellable that has the methods SalesSpeech$()$ and MakeSale$().$ Demonstrate that each object can use a SalesSpeech$()$method appropriately. Also, use a MakeSale$()$ method two or three times with each object, and display the final contents of each object$$s data fields.

First, create an abstract class named Salesperson. Fields include firstName and lastName; the Salesperson constructor requires both these values. Include properties for the fields. Include a method called GetName that returns a string that holds the Salesperson$$s full name$$the first and last names separated by a space. Then perform the following tasks:

Create an interface called ISellable containing: SalesSpeech$()$ and MakeSale$()$

Create two child classes of Salesperson and ISellable: RealEstateSalesperson and GirlScout.

The RealEstateSalesperson class contains fields for the following:

TotalValueSold $-$ The total value sold in dollars $($an int initialized to $0)$

TotalCommissionEarned $-$ Total commission earned $($a doubleinitialized to $0)$

CommissionRate $-$ The commission rate $($a double required as the last argument to the class constructor, after first name and last name$).$

The GirlScout class includes a field $($TotalBoxes of type int$)$ to hold the number of boxes of cookies sold, which is initialized to $0.$

Include properties for every field for both of the above classes.

In order to prepend the $ to currency values, the program will need to use the CultureInfo.GetCultureInfo method. In order to do this, include the statement using System.Globalization; at the top of your program and format the output statements as follows: WriteLine$("$This is an example: $\{0\}",$ value.ToString$("$C$",$ CultureInfo.GetCultureInfo$("$en$-$US$")))$;