public synchronized void withdraw(double amount){

		// Waste some time doing fake computations
		// do not remove or modify any of the following 3 statements
		double k = 999999999;
		for(int i=0;i<100;i++)
			k = k / 2;

			balance = balance - amount;

		// Waste some time doing fake computations
		// do not remove or modify any of the following 3 statements
		k = 999999999;
		for(int i=0;i<100;i++)
			k = k / 2;
	}