@Override
	public String howMuch(String item, String client, String market) {
		
		logger.info("Calculating how much is the delivery. " +
				"item " + item + ", client " + client + ", market " + market);

		// business rule: delivery date depends of the market last letter
		// business rule: delivery date depends of the client first letter
		char key = market.toUpperCase().charAt(market.length()-1);
		if ((key >= 'A') && (key <= 'D'))
			return "0.5";
		else if ((key >= 'E') && (key <= 'P'))
			return "0.3";
		else if ((key >= 'Q') && (key <= 'Z'))
			return "0.2";
		else if ((key >= '0') && (key <= '9'))
			return "0.1";
		else
			return "1.0";
	}