08. Trade Comissions

#include <string>
#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    string city;
    double sails;
    cin >> city >> sails;

    double comission = 0;

    if (city != "Sofia" && city != "Varna" && city != "Plovdiv" || sails < 0)
    {
        cout << "error" << endl;
    }
    else
    {
        if (city == "Sofia") {
            if (sails >= 0 && sails <= 500) { comission = 0.05; }
            else if (sails > 500 && sails <= 1000) { comission = 0.07; }
            else if (sails >= 1000 && sails <= 10000) { comission = 0.08; }
            else { comission = 0.12; }
        }
        else if (city == "Varna") {
            if (sails >= 0 && sails <= 500) { comission = 0.045; }
            else if (sails >= 500 && sails <= 1000) { comission = 0.075; }
            else if (sails >= 1000 && sails <= 10000) { comission = 0.1; }
            else { comission = 0.13; }
        }
        else if (city == "Plovdiv") {
            if (sails >= 0 && sails <= 500) { comission = 0.055; }
            else if (sails >= 500 && sails <= 1000) { comission = 0.08; }
            else if (sails >= 1000 && sails <= 10000) { comission = 0.12; }
            else { comission = 0.145; }
        }
        cout << fixed << setprecision(2) << comission * sails << endl;

    }

    return 0;
}