A handy app, What Percent Pro, to easily calculate percents! 1) Calculate what percent a number is of another number. 17 % of 83 is 14. 11. 2) Increase a number by a specific percentage. Increasing 17 by 83 % is 31. 11. 3) Find the precent discount of an item. 17 discounted by 83 % is 2. 89. 4) Calculate the selling price. Cost 17 Margin 83 % sell for 100.