Bank.LoanAccount.CalculateInterest C# (CSharp) Метод

        public override decimal CalculateInterest(int monthsCount)
        {
            if (monthsCount <= 2 && this.Customer == Customer.Company)
            {
                return 0;
            }
            else if (monthsCount <= 3 && this.Customer == Customer.Individual)
            {
                return 0;
            }
            else if (this.Customer == Customer.Company)
            {
                return this.Balance * (this.Interest / 100) * (monthsCount - 2);
            }
            else
            {
                return this.Balance * (this.Interest / 100) * (monthsCount - 3);
            }
        }

        static void Main()
        {
            DepositAccount depositPersonAcc = new DepositAccount(Customer.Individual, 10000.00M, 2.5);

            Console.WriteLine("Individual deposit account(balance = {0}) interest for 12 months = {1:F2}."
                              , depositPersonAcc.Balance, depositPersonAcc.CalculateInterest(12));
            Console.WriteLine("Withdrawing from this account 9500.");
            depositPersonAcc.Withdraw(9500);
            Console.WriteLine("Individual deposit account(balance = {0}) interest for 12 months = {1:F2}."
                              , depositPersonAcc.Balance, depositPersonAcc.CalculateInterest(12));
            Console.WriteLine("Try to withdraw 501.");
            depositPersonAcc.Withdraw(501);

            LoanAccount loanPersonAcc  = new LoanAccount(Customer.Individual, -15250.35M, 2.0);
            LoanAccount loanCompanyAcc = new LoanAccount(Customer.Company, -50000, 1.5);

            Console.WriteLine("\nIndividual loan account(balance = {0}) interest for 3 months = {1:F2}."
                              , loanPersonAcc.Balance, loanPersonAcc.CalculateInterest(3));
            Console.WriteLine("Individual loan account(balance = {0}) interest for 10 months = {1:F2}."
                              , loanPersonAcc.Balance, loanPersonAcc.CalculateInterest(10));
            Console.WriteLine("Company loan account(balance = {0}) interest for 10 months = {1:F2}."
                              , loanCompanyAcc.Balance, loanCompanyAcc.CalculateInterest(10));
            Console.WriteLine("Company loan account(balance = {0}) interest for 2 months = {1:F2}."
                              , loanCompanyAcc.Balance, loanCompanyAcc.CalculateInterest(2));

            MortgageAccount mortgagePersonAcc  = new MortgageAccount(Customer.Individual, -2500.50M, 3.2);
            MortgageAccount mortgageCompanyAcc = new MortgageAccount(Customer.Company, -1000M, 1);

            Console.WriteLine("\nIndividual mortgage account(balance = {0}) interest for 6 months = {1:F2}."
                              , mortgagePersonAcc.Balance, mortgagePersonAcc.CalculateInterest(6));
            Console.WriteLine("Individual mortgage account(balance = {0}) interest for 10 months = {1:F2}."
                              , mortgagePersonAcc.Balance, mortgagePersonAcc.CalculateInterest(10));
            Console.WriteLine("Individual mortgage account(balance = {0}) interest for 12 months = {1:F2}."
                              , mortgageCompanyAcc.Balance, mortgageCompanyAcc.CalculateInterest(12)); //for first 12 months interest is 60$
            Console.WriteLine("Individual mortgage account(balance = {0}) interest for 24 months = {1:F2}."
                              , mortgageCompanyAcc.Balance, mortgageCompanyAcc.CalculateInterest(24)); //for 24 months interest is 60$ for first 12months + 120$ for next 12 months
        }