Example:

package javaapplication;

import java.util.Scanner;

/**
 *
 * @author Rathorji
 */
public class JavaApplication {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        int total, score;
        int percentage;
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the total amount of score: ");
        total = sc.nextInt();

        System.out.println("Enter the score obtained: ");
        score = sc.nextInt();

        percentage = (score * 100 / total);

        System.out.println("The percentage is = " + percentage + "%");

    }

}


output:

run:
Enter the total amount of score:
400
Enter the score obtained:
200
The percentage is = 50%