using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello! Welcome to Muhammad's writing implements we sell pencils, pens, erasers, and markers.");

        byte pencils, pens, erasers, markers;

        Console.WriteLine("How many pencils do you want to buy?");

        pencils = byte.Parse(Console.ReadLine());

        Console.Clear();

        Console.WriteLine("How many pens do you want to buy?");

        pens = byte.Parse(Console.ReadLine());

        Console.Clear(); 

        Console.WriteLine("How many erasers do you want to buy?");

        erasers = byte.Parse(Console.ReadLine());

        Console.Clear(); 

        Console.WriteLine("How many markers do you want to buy?");

        markers = byte.Parse(Console.ReadLine());

        Console.Clear(); 

        decimal sum = pencils + pens + erasers + markers;

​

        Console.WriteLine("The sum of " + pencils +", " + pens +", " + erasers +", " + markers + " is " + sum);

        decimal subtotal;

        subtotal = pencils + pens + erasers + markers;

        decimal salestax;

        decimal shippingcost;

        if (subtotal <= 0)

        {

            shippingcost = 0M;

            Console.WriteLine("You need to spend money");

            }

        else if (subtotal > 0 && subtotal <= 50)

        {

            shippingcost = 7.99M;

            Console.WriteLine("Your shipping cost will be: " + shippingcost);

        }

            else if (subtotal > 50 && subtotal <= 100)

        {

            shippingcost = 9.99M;

            Console.WriteLine("Your shipping cost will be: " + shippingcost);

        }

            else if (subtotal > 100)

        {

            shippingcost = 0M;

            Console.WriteLine("Your shipping cost will be: " + shippingcost);

        }

            salestax = .08625M * subtotal;

            Console.WriteLine("Your sales tax will be: " + salestax);

        decimal grandtotal = subtotal + salestax;

​

Console.WriteLine("The grandtotal is " + subtotal +", " + salestax +", " + " is " + grandtotal);

Console.WriteLine("The subtotal is: " + subtotal);

Console.WriteLine("The grandtotal is: " + grandtotal);

​

    }

}