Create a common friend  interest_cal() of three classes  such as: Class A,B and C. Class A  is having principle(float) private  data member and inputA()  public member function for  taking input of principle, Class B  is having rate(float) private data  member and inputB() public  member function for taking  input of rate, Class C is having  time(float) private data  member and inputC() public  member function for taking  input of time. Friend function  interest_cal() calculates and  displays simple interest after  accessing private members of  class A,B and C respectively

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