Percentage C++ bribro

#include<iostream>

/// Returns the percentage % of n
double percentage(double n, double percentage) {
    return (n / 100) * percentage;
}

int main () {
    using namespace std;
    int n;
    cin >> n;

    cout << "Sconto sara' di: " << percentage(n, 20) << endl
        << "Prezzo rimanente di: " << n - percentage(n, 20) << endl;
}