题解 | #计算商品打折结算金额#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String str = bf.readLine();
        double price = Double.parseDouble(str);
        double pay = 0;
        if(price>=100 && price<500){
            pay = price*0.9;
        }
        if(price>=500 && price<2000){
            pay = price*0.8;
        }
        if(price>=2000 && price<5000){
            pay = price*0.7;
        }
        if(price>=5000){
            pay = price*0.6;
        }
        System.out.printf("%.1f",pay);
    }
}