Create a class named billing that includes four overloaded computebill() methods for a photo book store. • when computebill() receives a single parameter, it represents the price of one photo book ordered. add 8.5% tax, and return the total due.

• when computebill() receives two parameters, they represent the price of a photo book and the quantity ordered. multiply the two values, add 8.5% tax and return the total due.
• when computebill() receives three parameters, they represent the price of a photo book, the quantity ordered, and a coupon value. multiply the quantity and price, reduce the result by the coupon value, and then add 8.5% tax and return the total due.
• when computebill () receives four parameters, they represent the price of a photo book, the quantity ordered, a coupon value, and a weekly discount. multiply the quantity and price, reduce the result by the coupon value plus the weekly discount, and then add 8.5% tax and return the total due.

write a main () method that tests all three overloaded methods.

The Java code is given below with appropriate comments

Explanation:

Billing.java

//This is a BIlling class

public class Billing {

//Default constructor

public Billing()

{

}

//computeBill() method of having one parameter

public double computeBill(double price)

{

  return price+0.85*price;

}

//computeBill() method of having two parameter

public double computeBill(double price,int quantity)

{

  return price*quantity+0.85*price*quantity;

}

//computeBill() method of having three parameter

public double computeBill(double price,int quantity,double couponValue)

{

  return price*quantity+0.85*price*quantity-couponValue;

}

//computeBill() method of having four parameter

public double computeBill(double price,int quantity,double couponValue,double weeklyDiscount)

{

  return price*quantity+0.85*price*quantity-(couponValue+weeklyDiscount);

}

  public static void main(String[] args) {

  //Creating Billing Class Object

  Billing b=new Billing();

  //Displaying the cost of one book

System.out.println("Price of one Photo Book : $"+b.computeBill(45));

//Displaying the cost of 20 books

System.out.println("Price of 20 Photo Books : $"+b.computeBill(45,20));

//Displaying the cost of 20 books and having 50$ coupon

System.out.println("Price of 20 Photo Books and if we are having coupon value 50$ : $"+b.computeBill(45,20,50));

//Displaying the cost of 20 books, having 50$ coupon and 10$ discount

System.out.println("Price of 20 Photo Books ,if we are having coupon value 50$ and weekly discount of 10$: $"+b.computeBill(45,20,50,10));

  }

}

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation: