Get Input From User To Be Multiplied By Package Cost - Discounted Total?

I am new to java and this is one of my first program assignments. I can't figure out how to make the if else statements work. I am trying to get the input from the user to be multiplied by the package cost but it gives me an error. I also can't figure out how to solve for the discounted total.

Purpose of the program: To write a program that asks the user to enter the number of packages purchased. The program should then display the amount without any discount, the amount of the calculated discount (if any), and the total amount of the purchase after the discount is applied.

What the output should be:

Enter the number of packages purchased: 10
Your total without discount: $990.00
The discount is: $198.00
The discounted total: $792.00

import java.util.Scanner;
public class Practice {
public static void main(String[] args) {
double packageCost = 99.00;
double amtPackage = 10.00;
double withoutDiscount = packageCost * (double) amtPackage;

[Code] .....