import java.util.Scanner;

public class Main{

    public static void main(String[] args) {

        Scanner scan=new Scanner(System.in);

        System.out.println("请输入上次分数:");

        int lastscore=scan.nextInt();

        System.out.println("请输入本次分数:");

        int score=scan.nextInt();

        float highnum=((float)(score-lastscore)/(float)lastscore)*100;

        System.out.printf("这次比上次提高了：%.2f%%",highnum);

    }

}