A super class Bank has been defined to store the details of the customer in a bank. Define a subclass Interest to calculate the compound interest. 
  The details of the members of both the classes are given below:
  Class name : Bank
  Data members/instance variables:
  name : to store the name of the customer
  acc_no : integer to store the account number
  principal : to store the principal amount in decimals
  Methods / Member functions:
  Bank( ... ) : parameterized constructor to assign values to the
  data members
  void display( ) : to display the customer details
  Class name :Interest
  Data members/instance variables:
  rate : to store the interest rate in decimals
  time : to store the time period in decimals
  Methods / Member functions:
  Interest( ... ) : parameterized constructor to assign values to the
  data members of both the classes
  double calculate( ) : to calculate and return the compound interest using the formula [ CI = P ( 1 + R/100 )N − P] where, P is the principal, R is the rate and N is the time
  void display( ) : to display the customer details along with the
  compound interest
  Assume that the super class Bank has been defined. Using the concept of inheritance,
  specify the class Interest giving the details of the constructor(...), double calculate( ) and void display( ). 
  The super class, main function and algorithm need NOT be written.
        

Solution:

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