Need help taking this average grade and having it print out the letter grade equivalent based on the average percent

Then it should determine the letter grade for that average. I found the average but need help writing code to make that numerical value into a letter grade

The letter grade is based on the following grade range:

A: 90-100%B: 80-89%C: 70-79%D: 60-69% F: otherwise

import java.util.Scanner; import java.math.RoundingMode; import java.text.DecimalFormat;

public class a1 {

public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("enter first grade: "); double g1 = in.nextInt(); System.out.print("enter second grade: "); double g2 = in.nextInt(); System.out.print("enter third grade: "); double g3 = in.nextInt(); System.out.print("enter fourth grade: "); double g4 = in.nextInt(); System.out.print("enter fifth grade: "); double g5 = in.nextInt(); System.out.printf("your average grade is: %.2f",(g1+ g2+ g3+ g4+ g5)/5);

} }