Design a class that calculates a customer's monthly bill. It should

store the letter of the package the customer has purchased $($A$,$ B$,$ or

C$)$ and the number of minutes that were used. It should have a method

that returns the total charges. Demonstrate the class in a program

that asks the user to select a package and enter the number of minutes

used. The program should display the total charges

MobileCharges

PACKAGE$\_$IDENTIFIER$\_$A: char $=\text{'}$A$\text{'}$

PACKAGE$\_$IDENTIFIER$\_$B: char $=\text{'}$B$\text{'}$

PACKAGE$\_$IDENTIFIER$\_$C: char $=\text{'}$C$\text{'}$

PURCHASE$\_$PRICE$\_$A : double $=39\mathrm{.}99$

PURCHASE$\_$PRICE$\_$B : double $=59\mathrm{.}99$

PURCHASE$\_$PRICE$\_$C : double $=69\mathrm{.}99$

MINUTES$\_$PROVIDED$\_$A : double $=450\mathrm{.}0$

MINUTES$\_$PROVIDED$\_$B : double $=900\mathrm{.}0$

MINUTES$\_$PROVIDED$\_$C : double $=44640\mathrm{.}0$

PRICE$\_$PER$\_$MINUTE$\_$A : double $=0\mathrm{.}45$

PRICE$\_$PER$\_$MINUTE$\_$B ; double $=0\mathrm{.}40$

PRICE$\_$PER$\_$MINUTE$\_$C : double $=0\mathrm{.}00$

packageldentifier : char

minutesUsed ; double

minutesProvided : double

pricePerMinute : double

purchasePrice : double

additionalMinutes : double

additionalCharges ; double

totalCharges : double

MobileCharges$(p$; char, $m$; double$)$

setPackageldentifier$($p : char$)$ : void

setMinutesUsed$($m : double$)$ : void

getPackageldentifier$()$ : char

getMinutesUsed $0$ : double

getMinutesProvided $()$; double

getPricePerMinute $()$: double

getPurchasePrice $0$ : double

getAdditionalMinutes$()$ : double

getAdditionalCharges$0$: double

getTotalCharges $0$ : double

assuming that the Class MobileCharges is complete and filled out

create MobileChargesDemo so the Java project can actually carry out what it's supposed to do with this template

$//$Template MobileChargesDemo

import java.text.DecimalFormat; $//$ For the DecimalFormat class

import java.util.Scanner; $//$ For the Scanner class

public class MobileChargesDemo

$\{$

public static void main$($String$[]$ args$)$

$\{$

String input; $//$ To hold a line of input

char packageChr; $//$ To hold the package identifier

double minutes; $//$ To hold the number of minutes

$//$ Create a Scanner object for keyboard input.

Scanner keyboard $=$ new Scanner$($System$.$in$)$;

$//$ Get the package.

System.out.print$("$Enter the package the customer has purchased $($A$,$ B$,$ or C$)$: $")$;

input $=$ keyboard.nextLine$()$;

packageChr $=$ input.charAt$(0)$;

packageChr $=$ Character.toUpperCase$($packageChr$)$;

$//$ Validate the package indentifier.

$//$ Add your code

$//$ Add your code

$//$ Add your code

$//$ Add your code

$//$ Add your code

$\}$

$\}$