Add a method
public void addInterest(double rate)
to the BankAccount class that adds interest at the given rate. For example, after the statements
BankAccount momsSavings = new BankAccount(1000);
momsSavings.addInterest(10); // 10% interest
the balance in momsSavings is $1,100. Also supply a BankAccountTester class that prints the actual and expected balance.