Introduction - If you have any usage issues, please Google them yourself
For a supermarket promotion, use discount shopping discount method, if the amount of customers shopping f: 1000 ≤ f < 2000,95 break 2000 ≤ f < 3000,9 break 3000 ≤ f < 5000,85 fold f> 5000 , 8 fold. Write a program, enter the shopping section to calculate the payable