private void showPrice(Winkel winkel) {
		String id = askId();
		KortingStrategyType type = askKorting(id, winkel);
		int dagen = askDays();
		winkel.setKorting(id, type);
		JOptionPane.showMessageDialog(null, "Huurprijs: " + winkel.getHuurPrijs(id, dagen) + " euro.");
	}