The Lewis family dined at a restaurant. Their bill came to $52, and they plan on leaving a 19% gratuity. This means that the total amount they will pay is 119% of the bill.
OK....do not know what you are asking, but they will pay 119% * 52 = 1.19 * 52 = 61.88
You could estimate by saying 20% of 50 = 10 52 + 10 = $ 62