As far as the CAT is concerned, this chapter is important because the application of the concept of profit, loss and discount ranges from simple mathematical calculations in data interpretation (DI) to complex logical evaluations in QA. This chapter can be considered as an extension of percentage, the only difference being the terminology used in both the concepts. The terms we use in percentage are initial value, final value, percentage increase etc. But when we use the same terms in profit, loss and discount (PLD), the names get converted to cost price, selling price, profit percentage etc. Let us understand the concepts and learn problem solving methods for this concept.