Explanation

In lines 2 – 4, we have defined two instance variables, title and balance, in the Account class. We have set them to None and 0 respectively.

In line 7, we have defined SavingsAccount as a child class of Account.

In lines 8 – 10, we have defined the initializer for the SavingsAccount class and called the parent class initializer using super().

We have defined one instance variable, interestRate, in the SavingsAccount class and set it to

0

0

in the initializer.