void main() {

    List<Map<String, double>> incomeList = [
      {"Sales": 5000},
      {"Investment": 2000}
    ];

    List<Map<String, double>> expenseList = [
      {"Rent": 3000},
      {"Salaries": 2500}
    ];

    double totalIncome = 0;
    double totalExpense = 0;

    for (var item in incomeList) {
      totalIncome += item.values.first;
    }

    for (var item in expenseList) {
      totalExpense += item.values.first;
    }

    double net = totalIncome - totalExpense;

    print("Total Income: \$${totalIncome}");
    print("Total Expenses: \$${totalExpense}");

    if (net >= 0) {
      print("Your net profit is \$${net}");

      double tax = net > 0 ? net * 0.15 : 0;
      print("Tax to pay (15%): \$${tax}");
    } else {
      print("Your net loss is \$${net.abs()}");
    }
}