Discount prices and display total price

#include <iostream>
#include <vector>
#include <iomanip>

using namespace std;

// Enter any number of prices.
// Discount each one 25%, then sum them and
// add a 10% tax to the total.
// Display the discounted prices and the final total.

int main()
{
    vector<float> discounted_prices; // A string that may represent a number.
    float price = 0; // Individual prices.
    float discount_price = 0; // Price after 25% discount.
    float sum_of_discounted_prices = 0; // Sum of discounted prices.
    float final_price = 0; // Final price after 25% discount and 10% tax.

    cout << "Enter any number of prices.\n"
        "Enter -1 when done\n";
    cin >> price; // Get the next price.
    while (price != -1) // While there are more prices to enter,
    {
        discount_price = .75 * price; // Discount the price.
        sum_of_discounted_prices += discount_price; // Add it to the sum.
        discounted_prices.push_back(discount_price); // Store the price.
        cin >> price; // Get the next price.
    }

    final_price = .9 * sum_of_discounted_prices; // Take 90% of sum.

    cout << "\nList of prices after 25% discount.\n";
    for (float saved_price : discounted_prices) // For each price,
    {
        // Display two decimal points.
        cout << fixed << setprecision(2) << saved_price << '\n';
    }

    // Display the final price.
    cout << "\nFinal total including 10% tax = " << final_price << '\n';

    return 0; // End the program.
}