Java Program to Calculate CGPA

public class CalculateCGPA {
    public static void main(String[] args) {
        int n = 5;
        double[] marks = { 90, 80, 70, 80, 90 };
        double[] grade = new double[n];
        double cgpa, sum = 0;

        for (int i = 0; i < n; i++) {
            grade[i] = (marks[i] / 10);
        }

        for (int i = 0; i < n; i++) {
            sum += grade[i];
        }

        cgpa = sum / n;
        System.out.println("CGPA = " + cgpa);
        System.out.println("Percentage from CGPA = " + cgpa * 9.5);
    }
}

CGPA = 8.2
Percentage from CGPA = 77.9