The menu price of a sandwich at a restaurant is $6. The meal is subject to a 5% food tax, and Marcy would like to leave a gratuity of 20% on the pre-tax cost. Which plans will work to correctly determine exactly how much money, including tax and tip, Marcy will need? Calculate the tax, and then find the tip on the new total. Calculate the tip, and then find the tax on the new total. Add the percents to get 25%, and then find 25% of $6 to add to the bill. Calculate the tip and tax on the $6 total separately, and then add both to the bill.