func displayBalance

class BankAccount {
	var accountBalance: Float
	var accountNumber: Int
	
	init(number: Int, balance: Float) {
		accountNumber = number
		accountBalance = balance
	}
	
	func displayBalance() {
		print("Number \(accountNumber)")
		print("Current balance is \(accountBalance)")
	}
}

class SavingsAccount: BankAccount {
	var interestRate: Float = 0.0
	
	init(number: Int, balance: Float, rate: Float) {
		super.init(number: number, balance: balance)
		interestRate = rate
	}
	
	func calculateInterest() -> Float 	{
		return interestRate * accountBalance
	}
	
	override func displayBalance() {
		super.displayBalance()
		print("Prevailing interest rate is \(interestRate)")
	}
}

let savings1 = SavingsAccount(number: 13062020, balance: 1001.00, rate: 0.109)
print(savings1.calculateInterest())
savings1.displayBalance()