Calculate number of apps to sell to make $100,000

// Determine how many apps to sell at a
// particular price to make $100,000.

#include <iostream>
#include <cmath> // ceil(), rounds up to the next integer

using namespace std;

// This function calculates how many apps to
// sell, based on the price, to make $100,000
// after 25% tax.
int sell_this_many(float price)
{
    // Calculate exactly how many apps reach the goal after taxes.
    // (revenue goal / portion after taxes) / price of app
    float first_result = (100000 / .75) / price;

    // Cannot sell a fraction of an app, so
    // round up to the next whole number.
    return ceil(first_result);
}



int main()
{
    float price = 0; // Chosen price of app.
    int num_to_sell = 0; // How many to sell.

    cout << "What is the price of your app? ";
    cin >> price; // Get price of app.

    num_to_sell = sell_this_many(price); // Calculate how many to sell.

    // Display result.
    cout << "To make $100,000 after taxes, you must sell " << num_to_sell << " apps.\n";

    return 0; // End the program.
}