Write a program that demonstrates how to compute Sales Tax public class Sales Tax { public static void main(String[] args) { // Constants // Variables Hint: Use double for the data type // Amount of purchase // Amount of state sales tax // Amount of county sales tax // Total sales tax // Total cost of the purchase // Create a Scanner object for keyboard input. // Get the amount of the purchase. // Calculate the state sales tax. // Calculate county sales tax. // Calculate the total sales tax. // Calculate the total purchase cost. // Display the results.