public void increasePrice(int percentage) {
		List<Product> products = productDao.getProductList();
		if (products != null) {
			for (Product product : products) {
				double newPrice = product.getPrice().doubleValue()
						* (100 + percentage) / 100;
                product.setPrice(newPrice);
				productDao.saveProduct(product);
			}
		}

	}