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Java Program

                             Product Calculation 

import java.text.DecimalFormat;
class ProductExcludingTax
 {
    private String productName;
    private int quantity;
    private double price;
    private double taxRate;
    public ProductExcludingTax(String productName, int quantity, double price, double taxRate)
 {
        this.productName = productName;
        this.quantity = quantity;
        this.price = price;
        this.taxRate = taxRate;
    }
    public double calculateTotalAmount()
 {
        double totalAmount = quantity * price;
        double taxAmount = totalAmount * taxRate;
        return totalAmount + taxAmount;
    }
    public void display()
 {
        DecimalFormat df = new DecimalFormat("#.##");
        double totalAmount = calculateTotalAmount();
        System.out.println("Product name: " + productName);
        System.out.println("Quantity: " + quantity);
        System.out.println("Price per unit: $" + df.format(price));
        System.out.println("Tax rate: " + (taxRate * 100) + "%");
        System.out.println("Total amount (including tax): $" + df.format(totalAmount));
    }
}
class ProductIncludingTax
 {
    private String productName;
    private int quantity;
    private double originalPrice;
    private double taxAmount;
    private double taxRate;
    public ProductIncludingTax(String productName, int quantity, double originalPrice, double taxRate)
 {
        this.productName = productName;
        this.quantity = quantity;
        this.originalPrice = originalPrice;
        this.taxRate = taxRate;
        this.taxAmount = originalPrice * taxRate;
    }
    public void display()
 {
        DecimalFormat df = new DecimalFormat("#.##");
        System.out.println("Product name: " + productName);
        System.out.println("Quantity: " + quantity);
        System.out.println("Tax included price per unit: $" + df.format(originalPrice));
        System.out.println("Tax rate: " + (taxRate * 100) + "%");
        System.out.println("Tax amount: $" + df.format(taxAmount));
        System.out.println("Original price (excluding tax): $" + df.format(originalPrice - taxAmount));
    }
}
public class Main
 {
    public static void main(String[] args)
 {
        ProductExcludingTax product1 = new ProductExcludingTax("Book", 2, 25.0, 0.08);
        product1.display();
        System.out.println();
        ProductIncludingTax product2 = new ProductIncludingTax("Laptop", 1, 1500.0, 0.10); 
        product2.display();
    }
}

Output:

Product name: Book
Quantity: 2
Price per unit: $25.0
Tax rate: 8.0%
Total amount (including tax): $54.0

Product name: Laptop
Quantity: 1
Tax included price per unit: $1500.0
Tax rate: 10.0%
Tax amount: $150.0
Original price (excluding tax): $1350.0

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