How do I have to add the function for calculating the the percentage of correct answer

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Java

i have compile and run this program and it works just fine, but i wanna add 1 more function into it which is when the total answered question is more than 75% the system will print "Congratulation, you are ready for the next level", or else it will print "You have to see your teacher". So my question is who can help me do the calculation of the correct answer because i dont know how to calculate the percentage of the correct answer :(

What I have tried:

import java.util.*;

class learnMultiplication
{
   public static void main(String args[])
   {
		int correctAnswers = 0;
		int actualAnswer, userAnswer;
		int randomNum[] = new int[2];
		String question;
		Scanner sc = new Scanner(System.in);
      
       //Loop till user answers 10 correct questions
       while(correctAnswers <= 9)
       {
           //Generate a question
           question = newQuestion(randomNum);

           //Calculate actual answer
           actualAnswer = randomNum[0] * randomNum[1];

           //Display question to user
           System.out.print("\n " + question+"\n");
          
           //Get answer from user
           userAnswer = sc.nextInt();
		   
		   

           //If both answers doesn't match loop both of them matches
           while(userAnswer != actualAnswer)
           {
               //Display a wrong message to user
               displayWrongMessage();

               //Displaying the same question again
               System.out.println("\n " + question+"\n");
              
               //Get answer from user
               userAnswer = sc.nextInt();
           }

           //Once userCorrectMe answers correctly display correct message
           displayCorrectMessage();

           //Counting total number of correct answers
           correctAnswers++;
		   

       }
	   
	   
	   
   }
  
   //Method that displays a new question to user
   public static String newQuestion(int randomNum[])
   {
       String question;
      
       int Min = 1, Max = 4;

       //Generate two 1 digit integers randomly
       randomNum[0] = Min + (int)(Math.random() * ((Max - Min) + 1));
       randomNum[1] = Min + (int)(Math.random() * ((Max - Min) + 1));
      
       //Forming question
       question = " How much is " + randomNum[0] + " times " + randomNum[1] + " ? ";

       //Return question to user
       return question;
   }
  
   //Method that displays wrong message to user
   public static void displayWrongMessage()
   {
       int index;
       String message = "";

       //Generate a random number for wrong answer 
       int Min = 0, Max = 3;
       index = Min + (int)(Math.random() * ((Max - Min) + 1));
      
       //Selecting message
       switch(index)
       {
           case 0: message = "No. Please try again."; 
					break;
           case 1: message = "Wrong. Try once more."; 
					break;
           case 2: message = "No. Don't give up!"; 
					break;
           case 3: message = "No. Keep trying."; 
					break;
           default: break;
       }

       //Printing the message present at the generated index
       System.out.println("\n " + message + " \n");
   }
  
   //Method that displays correct message to user
   public static void displayCorrectMessage()
   {
       int index;
       String message = "";

       //Generate a random number for correct answer 
       int Min = 0, Max = 3;
       index = Min + (int)(Math.random() * ((Max - Min) + 1));
      
       //Selecting message
       switch(index)
       {
           case 0: message = "Very good!"; 
					break;
           case 1: message = "Excellent!"; 
					break;
           case 2: message = "Nice work!"; 
					break;
           case 3: message = "Keep up the good work!"; 
					break;
           default: break;
       }

       //Printing the message present at the generated index
       System.out.println("\n " + message + " \n");
   }
   
 
}