class ProfitTaxCalculator:
    def __init__(self, income_tax_rate=0.1):
        self.transactions = []
        self.income_tax_rate = income_tax_rate
    
    def add_transaction(self, amount, is_income=True, vat_rate=0.0, includes_vat=True):
        """
        Add a transaction.
        :param amount: The amount billed (positive number).
        :param is_income: True if it is revenue, False if it is an expense.
        :param vat_rate: VAT rate applied (e.g., 0.2 for 20% VAT).
        :param includes_vat: True if the amount provided includes VAT, False if it's net.
        """
        if vat_rate > 0:
            if includes_vat:
                vat_amount = amount * vat_rate / (1 + vat_rate)
                net_amount = amount / (1 + vat_rate)
            else:
                vat_amount = amount * vat_rate
                net_amount = amount
        else:
            vat_amount = 0
            net_amount = amount
        
        self.transactions.append((net_amount, vat_amount, is_income))
    
    def calculate_results(self):
        total_income = sum(t[0] for t in self.transactions if t[2])
        total_expenses = sum(t[0] for t in self.transactions if not t[2])
        total_vat_collected = sum(t[1] for t in self.transactions if t[2])
        total_vat_paid = sum(t[1] for t in self.transactions if not t[2])
        net_profit = total_income - total_expenses
        income_tax_due = net_profit * self.income_tax_rate if net_profit > 0 else 0
        final_profit = net_profit - income_tax_due
        
        return {
            "Total Revenue": total_income,
            "Total Expenses": total_expenses,
            "VAT Collected": total_vat_collected,
            "VAT Paid": total_vat_paid,
            "Net Profit (Taxable)": net_profit,
            "Income Tax Due": income_tax_due,
            "Final Profit (After Tax)": final_profit
        }
    
    def display_summary(self):
        results = self.calculate_results()
        print("\n--- Financial Summary ---")
        for key, value in results.items():
            print(f"{key}: {value:.2f} BGN")
        print("--------------------------\n")

if __name__ == "__main__":
    calc = ProfitTaxCalculator()
    while True:
        try:
            amount = float(input("Enter transaction amount (or 0 to finish): "))
            if amount == 0:
                break
            type_choice = input("Is this income? (y/n): ").strip().lower() == 'y'
            vat_rate = float(input("Enter VAT rate (e.g., 0.2 for 20% or 0 for none): "))
            includes_vat = input("Does the amount include VAT? (y/n): ").strip().lower() == 'y'
            calc.add_transaction(amount, type_choice, vat_rate, includes_vat)
        except ValueError:
            print("Invalid input. Please enter numbers correctly.")
    
    calc.display_summary()