public void printReceipt(File inputfile,File outputFile){
	   ShoppingBakets<ConcreteItem> shoppingBaskets = null;
	   ReadFileToShoppingBasketsService fileToShoppingBasketService;
	   fileToShoppingBasketService = ReadFileToShoppingBasketsService.getInstance();
	   WriteFileFromShoppingBasketsService writefileService = WriteFileFromShoppingBasketsService.getInstance();
	   try {
		// convert eachline in file into item object and store into item list
		shoppingBaskets = fileToShoppingBasketService.load(inputfile);
		// store calculated item back into output file
	    writefileService.write(outputFile, shoppingBaskets);	   		
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
       

   }