i know the code is far from being complete i really need help with this

any help would be greatly appreciated

so im trying to do a program, so what i want the program to do is

give people the option to use a protection plan- i want it to give them the choice of 3 options the first one with a 10 percent of the overall price second with 20 percent and third option with 30 percent

let say i put in the price i want like 300 dollars

then i ask the customer if she or he wants any of the protection plans

the code is in java can someone please help me

import java.util.Scanner;

import java.text.DecimalFormat;

public class BestBuyPay

{

public void display_menu()

{

System.out.println("1) Option 1 2) Option 2 3) Option 3");

System.out.print("Selection: ");

}

public void askquestion()

{

System.out.println("Would you like to continue or get no coverage plan?");

System.out.println("To proceed enter 9.");

System.out.println("If you wish to quit enter 0.");

Scanner q = new Scanner(System.in);

switch (q.nextInt())

{

case 0:

System.out.println ("Thak you for your purchase today have a nice day :).");

break;

case 9:

System.out.println ("Please continue.");

new BestBuyPay();

break;

default:

System.err.println ( "error" );

break;

}

}

public BestBuyPay()

{

Scanner in = new Scanner(System.in);

display_menu();

switch (in.nextInt())

{

case 0:

System.out.println("You selected no protection plan");

askquestion();

break;

case 1:

System.out.println ( "You Selected option 1" );

askquestion();

break;

case 2:

System.out.println ( "You Selected option 2" );

askquestion();

break;

case 3:

System.out.println ( "You Selected option 3" );

askquestion();

break;

default:

System.err.println ( "Unrecognized option" );

break;

}

}

public static void main (String[]args)

{

new BestBuyPay();

}

}

class BestBuy

{

int num(int x,double y,double t)

{

double optionone= .10;

int price;

y=.10;

double w=.20;

double n=.30;

t=.0825;

{

if (optionone=y)

{

System.out.print(price*y*t);

}

else if (optiontwo=w )

{

System.out.print(price*w*t);

}

else if (optionthree=n)

{

System.out.print(price*n*t);

};

}

}

}