Question

import static java.lang.System.*;
import java.util.Scanner;

public class Sales{

//you haven't learned about "static" yet but take it on faith that it is needed
//we'll discuss in future classes what it actually means and why you need it
//create a private static variable for price
//create a private static variable for discountRate - it's an integer
//create a private static variable for tax


// the sale method takes in no parameters
// there are 3 print satements and the method returns the final sale price
public static double sale(){

//write your code here. Use the Word doc example as a guide to what the print statements
//should look like. Don't forget the "return" statement.

}

/*
*The main method is what is executed when the "run" button is clicked.
*It is necessary, in this case, for the program to be tested.
*Actually study this code and trace through it to see how the Scanner is used to assign
* values to the variables. Also pay attention to the use of print, println and \n to cause the
* output to be formatted the way it is in the example.
*/

public static void main(String[] args){
Scanner kb = new Scanner(System.in);
System.out.print("Please enter a price: ");
price = kb.nextDouble();
System.out.println(price + "\n");
System.out.print("What is the tax rate? ");
tax = kb.nextDouble();
System.out.println(tax);
discountRate = (int)(Math.random() * 40);
System.out.println("Result returned is " + sale());
}
}




Can anyone help with this

Answer 1

First you add the three static variables as instructed:

    private static double price;
    private static int discountRate;
    private static double tax;

Then you implement the sale() method:

public static double sale(){
    System.out.printf("Price before discount: %.2f\n", price);

    double sale = price * (1-(double)discountRate/100.0);
    System.out.printf("Price after discounting %d%% but before tax: %.2f\n", discountRate, sale);

    sale *= (1+tax/100.0);
    System.out.printf("Discounted price with %.1f%% tax added: %.2f\n", tax, sale);

    return sale;
}

I kind of took a stab at how to calculate the sale. Not sure if the tax has to be added before or after the discount. But I'm sure you can fix that if needed.