If$-$Else$-$If$-$Statement

Audlobooks.cs

An online audiobook service provider has three different subscription packages for its customers:

Package A: For $$9\mathrm{.}95$ per month, $10$ audiobooks are provided. Additional books are $$2\mathrm{.}00$ per book.

Package B: For $$13\mathrm{.}95$ per month, $20$ audiobooks are provided. Additional books are $$1\mathrm{.}00$ per book.

Package C$.$ For $$19\mathrm{.}95$ per month, unlimited audiobook access is provided.

Write a program that calculates a customer's monthly bill using an If$-$Else$-$If statement. It should:

Ask the user to enter the letter of the package the customer fias purchased $($A$,$ B$,$ or C$)$

Ask the user to enter the number of audiobooks that were read

Display the total charges

Display a message indicating that the wrong input was entered $($i$.$e$.,$ if someone enters F$)$

Variable declarations o Constant double variable for the following:

Each subscription base price

Book price for additional books for each relevant subscription package

Number of books included for each relevant subscription package o choice $-$ char input from user o

numBooks$-$ int input from user o totalCharges $-$ double calculated total

Other o Rename your file as Audiobooks.cs

The constant variables should replace hard coded data, including in the calculations o

Account for uppercase or lowercase input

Hint: there are a couple ways to do this:

string has a couple methods

modify your conditional statement $($but do not create a separate condition for upper and lowercase$)$

Format the output to $2$ decimal places

Run and test your program

$**$BONUS: In the if$-$else$-$if statement, only the final else condition contains a write statement.