import java.util.Scanner;

import com.sun.corba.se.spi.orbutil.fsm.Guard.Result;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入你上次的考试成绩: ");
        int lastScore = scanner.nextInt();
        System.out.print("请输入你本次的考试成绩: ");
        int currentScore = scanner.nextInt();
        float result = (float)(currentScore - lastScore) / lastScore * 100;
        System.out.printf("你的成绩较上次提高了：%.2f%%\n", result);
    }
}