Sales Tax Calculator: For either Point-of-Sale or After-the-Sale methods.

SalesTax.java

import java.text.DecimalFormat;
import java.util.Scanner;

public class SalesTaxInput {

    public static void main(String[] args){
        System.out.print("What are your taxable sales? ");
        double sales = getInput();
        sales = SalesTax.roundTwoDecimals(sales);
        System.out.print("What is your sales tax rate? 1% = .01: ");
        double taxRate = getInput();
        String timing = SalesTax.getTimingOfTaxCalculation();

        double taxes = 0;
        if ("now".equals(timing)) {
            taxes = SalesTax.calculateSalesTax(sales, taxRate);
        }   else if ("later".equals(timing))  {
            taxes = SalesTax.calculateTaxAfterTheSale(sales, taxRate);
            sales = sales - taxes;
        }   else {
            System.out.println("We didn't recognize your answer.  Please try again. ");
        }

        System.out.println("Total Sales: " + sales);
        System.out.println("Total Sales Tax: " + taxes);
        System.out.println();
        System.out.println("Total amount collected: " + (sales + taxes));

    }
    public static double getInput(){
        Scanner in = new Scanner(System.in);
        return in.nextDouble();
    }
}



public class SalesTax {

    public static double calculateSalesTax(double sales, double taxRate)
    {
        double i = sales * taxRate;
        i = roundTwoDecimals(i);
        return i;
    }

    public static double calculateTaxAfterTheSale(double sales, double taxRate)
    {
        double i = (sales - (sales/(1+taxRate)));
        i = roundTwoDecimals(i);
        return i;
    }

    public static double roundTwoDecimals(double d) {
        DecimalFormat twoDForm = new DecimalFormat("#.##");
        return Double.valueOf(twoDForm.format(d));
    }

    public static String getTimingOfTaxCalculation(){
        System.out.println("Are you collecting sales tax now, or are you calculating" +
                " sales tax based on total collections?");
        System.out.print("Please type the word 'Now' or 'Later':");
        Scanner in = new Scanner(System.in);
        String i = in.next();
        i = i.toLowerCase();
        return i;
    }
}