HelpTrying to figure out how to code this program correctly

import java.util.Scanner;
import java.math.*;
public class MyShippingCharges3{
private static double WeightOfPackage;
private static int MilesShipped;
private static double tax = 1.7;
private static double tax1 = 2.2;
private static double tax2 = 6.7;
private static double tax3 = 9.8;
private static double result;
   public static void main(String [] args){
      readData();
      calculations();
      printOutput();
      displayTable();
   }
      
   public static void readData(){
      Scanner sc = new Scanner(System.in);
      System.out.print("Enter weight of package in KG: ");
      WeightOfPackage = sc.nextDouble();
      System.out.print("Enter how many miles the package will travel: ");
      MilesShipped = sc.nextInt();
   }
   
   public static void calculations(){
        if (WeightOfPackage <= 1 && MilesShipped <= 1000){
         result = tax;
            if (MilesShipped > 1000 && MilesShipped < 2000){
               result = tax * 2;
               }
         }
        
        else if (WeightOfPackage > 1 && WeightOfPackage <= 5) {
            result = 1000 / MilesShipped * tax1;
        } else if (WeightOfPackage > 5 && WeightOfPackage <= 10) {
            result = 1000 / MilesShipped * tax2;
        } else if (WeightOfPackage > 10) {
            result = 1000 / MilesShipped * tax3;
        }    }
   
   public static void printOutput(){
       System.out.print("Your cost is: " + result);
   
   }
   
   public static void displayTable(){
   
   
   }
   
}

import java.util.Scanner;

public class MyShippingCharges {
	
	public static void main(String[] args) {
		
		//initialize variables (this is done within main because its unnessessary to have so many methods)
		int milesShipped;
		double weightOfPackage, tax = 1.7, tax1 = 2.2, tax2 = 6.7, tax3 = 9.8, result;
		
		//ask user input
		Scanner input = new Scanner(System.in);
		System.out.println("Enter the weight of package in KG :");
		weightOfPackage = input.nextDouble();
		System.out.println("Enter distance shipped in miles :");
		milesShipped = input.nextInt();
		
		//first lets check how far the item traveled so we can get our multiplier
		float multiplier = 0;
		
		if (milesShipped <= 1000){
			multiplier = 1;
		}else {
			multiplier = milesShipped / 1000;
		}
		
		//second ill check the weight of the package
		if (weightOfPackage >= 10){
			//now multiply the tax by the (multiplier)
			
			result = multiplier*tax3;
			
		}else if (weightOfPackage >= 5){
			
			result = multiplier*tax2;
		
		}else if (weightOfPackage >= 1){
			
			result = multiplier*tax1;
		
		}else {
			
			result = multiplier*tax;
		}
		System.out.println("Your extimated cost will be : "+result);
		System.out.println("Thanks for using P4$$1V3's tax calculator!");
	}	
}