Game of intervals

import java.util.Scanner;

public class GameOfIntervals {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int gameRounds = Integer.parseInt(scanner.nextLine());

        int from0To9 = 0;
        int from10To19 = 0;
        int from20To29 = 0;
        int from30To39 = 0;
        int from40To50 = 0;
        int invalidNumbers = 0;
        double result = 0;
        for (int i = 1; i <= gameRounds ; i++) {
            int number = Integer.parseInt(scanner.nextLine());
            if (number >= 0 && number < 10 ) {
                from0To9++;
                result += number * 0.20;
            }else if (number >= 10 && number < 20) {
                from10To19++;
                result += number * 0.30;
            }else if (number >= 20 && number < 30) {
                from20To29++;
                result += number * 0.40;
            }else if (number >= 30 && number < 40) {
                from30To39++;
                result += 50;
            }else if (number >= 40 && number <= 50) {
                from40To50++;
                result += 100;
            }else {
                invalidNumbers++;
                result = result / 2;
            }

        }
        System.out.printf("%.2f%n",result);
        System.out.printf("From 0 to 9: %.2f%%%n",from0To9 / (double)gameRounds * 100);
        System.out.printf("From 10 to 19: %.2f%%%n",from10To19 / (double)gameRounds * 100);
        System.out.printf("From 20 to 29: %.2f%%%n",from20To29 / (double)gameRounds * 100);
        System.out.printf("From 30 to 39: %.2f%%%n",from30To39 / (double)gameRounds * 100);
        System.out.printf("From 40 to 50: %.2f%%%n",from40To50 / (double)gameRounds * 100);
        System.out.printf("Invalid numbers: %.2f%%",invalidNumbers / (double)gameRounds * 100);
    }
}