You and some friends went out to T.G.I.Fridays for dinner. You ordered a root beer, sweet potato fries and cheese quesadillas. The total bill came to $21.86. Your dad as told you many times that it's important to leave a good tip; about 20%. You have $27.00 in your wallet. Can you leave a 20% tip? How much would the total be if you left a 15% tip? Can you cover the cost?