For example, 10% discount = 10% discount

Equivalence relation:

Current price = original price × discount

Original price = current price ÷ discount

Discount = (original price-current price) ÷ original price

Question type:

1. Find out what the discount price or discount is. The simplest question type.

2. Comparison of different discount methods. That is to compare which discount is more affordable and simpler.

3. Discuss and find the best value through classification. Different price ranges have different discount methods, so it is necessary to establish a piecewise function, and often it is necessary to get a maximum value at the end. This kind of question needs patience and won't be difficult.

4. Mathematical planning. Usually, as the planner of discount activities, the problem solver needs to establish multiple functions and consider various factors, such as cost, selling price and customer purchase. Such problems may be difficult and need to be carefully sorted out.

Hope to adopt