Programming Fundamentals Sample Exam II

Блокирах на най-простата задача "Soft Uni Airline". Тестовете ми излизат, обаче дава 20 точки. ако някой може да ми пососчи грешката?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace sample_exam
{
    class Program
    {
        static void Main(string[] args)
        {
            var flights = decimal.Parse(Console.ReadLine());

            decimal prophitMoney = 0;
            decimal lostMoney = 0;
            decimal overall = 0;

            for (int i = 1; i <= flights; i++)
            {
                var adults = decimal.Parse(Console.ReadLine());
                var adultTicketPrice = decimal.Parse(Console.ReadLine());
                var kids = decimal.Parse(Console.ReadLine());
                var kidsTicketPrice = decimal.Parse(Console.ReadLine());
                var fuelPrice = decimal.Parse(Console.ReadLine());
                var fuelConsumption = decimal.Parse(Console.ReadLine());
                var flightDuration = decimal.Parse(Console.ReadLine());

                decimal expences = flightDuration * fuelConsumption * fuelPrice;
                decimal income = (adults * adultTicketPrice) + (kids * kidsTicketPrice);

                decimal total = income - expences;


                if (total < 0)
                {
                    lostMoney += total;
                }
                else
                {
                    prophitMoney += total;
                }

            }
            overall = prophitMoney + lostMoney;

if (lostMoney < 0)
Console.WriteLine("We've got to sell more tickets! We've lost {0:f3}$." , lostMoney);

            if (prophitMoney > 0 && overall > 0 )
            {
                Console.WriteLine("You are ahead with {0:f3}$.", prophitMoney);
                Console.WriteLine("Overall profit -> {0:f3}$.", overall);
                Console.WriteLine("Average profit -> {0:f3}$.", overall / flights);
            }
        }
    }
}