Java tip calculator

Code:

import java.util.Scanner;
 
public class TipCalculator {
 
  public static void main(String [] args) {
 
    double rate1 = 0.1;
    double rate2 = 0.15;
    double rate3 = 0.2;
 
    Scanner keyboard = new Scanner(System.in);
 
    System.out.print("Enter the purchase price: ");
    double total = keyboard.nextDouble();
 
    System.out.printf("10%%: %.2f \n", (total*rate1));
    System.out.printf("15%%: %.2f \n", (total*rate2));
    System.out.printf("20%%: %.2f \n", (total*rate3));
  }
}

Output:

$ java TipCalculator
Enter the purchase price: 29.99
10%: 3.00 
15%: 4.50 
20%: 6.00