In Lab 3, you wrote a program for a restaurant, which had no methods. Create a program similar to that one (you can even pull up your old code to edit if you wish), but with methods to calculate the billing. The following methods are required: calculateDiscount() //This will calculate the price after discount. calculateFinalPrice() //This will add the tax (4.6%) and calculate the final price after the discount. You must determine the parameters and return value type for each method yourself. You may also add your own methods if you believe it will be useful.