Calcular el precio con descuento según el total de la compra en C++

#include <iostream>  // Include input/output stream
#include <iomanip>    // Include iomanip for controlling the output format

using namespace std;

int main() {
    double totalAmount;  // Variable to store the total amount of the purchase
    double finalPrice;   // Variable to store the final price after applying the discount
    double discount;     // Variable to store the discount percentage

    // Prompt the user for the total amount of the purchase
    cout << "Enter the total amount of your purchase: $";
    cin >> totalAmount;  // Get the user's input for total amount

    // Apply the discount based on the total amount
    if (totalAmount >= 100) {
        discount = 0.20;  // Apply 20% discount for purchases above or equal to $100
    } else if (totalAmount >= 50) {
        discount = 0.10;  // Apply 10% discount for purchases between $50 and $99.99
    } else {
        discount = 0.05;  // Apply 5% discount for purchases below $50
    }

    // Calculate the final price
    finalPrice = totalAmount - (totalAmount * discount);  // Subtract discount from total

    // Display the result with proper formatting
    cout << fixed << setprecision(2);  // Set output format to 2 decimal places
    cout << "Original amount: $" << totalAmount << endl;  // Show the original total amount
    cout << "Discount applied: " << discount * 100 << "%" << endl;  // Show the discount percentage
    cout << "Final price after discount: $" << finalPrice << endl;  // Display the final price
    return 0;  // End of the program
}

 Salida

Enter the total amount of your purchase: $120
Original amount: $120.00
Discount applied: 20%
Final price after discount: $96.00