text: #include <iostream>
  #include <string>
  using namespace std;
  
  class Account
  {
  	public:
  		void calculate()
  		{
  			amount += amount * interestRate;
  		}
  		
  		static double rate() { return interestRate; }
  		static void rate(double);
  		
  	private:
  		string owner;
  		double amount;
  		static double interestRate;
  		static double initRate();
  };
  
  void Account::rate(double newRate)
  {
  	interestRate = newRate;
  }
  
  int main()
  {
  	
  	return 0;
  }