I am getting 80 demeritpoints according to me calculation but I should be getting 85 demerit points instead, not sure where I am going wrong in my code?

** Represents a driver in New Zealand*/
public class Driver{

   private String name;
   private double demeritPoints = 0;
   private final int MAX_DEMERIT = 100;
   private boolean banned;
   
   /** Takes a String to initialise the name data field
      @param n this driver's name
   */
   public Driver(String n){
      name = n;
   }

   /** Takes two doubles representing the speed limit and the speed this driver was going. 
    It adjusts their demerit points total accordingly and then determines if they are banned
    @Fred speedLimit the speed limit in place as they are pulled over
    @Fred clockedSpeed the speed at which they have been clocked
   */
   public void pulledOverSpeeding(double speedLimit, double clockedSpeed){  
      // code goes here
      double overSpeedLimit = clockedSpeed - speedLimit;
      if (overSpeedLimit <=10) {
         demeritPoints +=10;  
      } else if ( overSpeedLimit <=20){
         demeritPoints +=demeritPoints;
      } else if ( overSpeedLimit <= 30){
         demeritPoints+=demeritPoints;
      } else if ( overSpeedLimit <= 35){
         demeritPoints+=demeritPoints;
      } else if (overSpeedLimit > 35){
         demeritPoints +=demeritPoints;
      }
      setDemeritPoints(demeritPoints);
      System.out.println(demeritPoints);
   }
   
   public void setDemeritPoints(double newDemeritPoints){
      demeritPoints = demeritPoints + newDemeritPoints;
   }
   
   public boolean getBanned (){
      if(demeritPoints >= MAX_DEMERIT){
         return true;
      }else{
         return false;
      }
   }
 
   
   /**Displays the driver's details.*/
   public void displayDriverDetails(){
      System.out.println("Name: " + name);
      System.out.println("Current demerit points: " + demeritPoints);
      System.out.print(name + " is currently "); 
      banned = getBanned();
      if(banned){
         System.out.print("not "); 
      } 
      System.out.println("allowed to drive.");
   }
   
  }



Application 

/** A class responsible for penalising Drivers for speeding*/

public class TrafficCop{
	public static void main (String[] args){
		Driver d1 = new Driver("Fred");

		// display the details of d1

      d1.displayDriverDetails();
      
	   // Fred is pulled over doing 82 kph in a 50kph zone – call the appropriate method

      d1.pulledOverSpeeding(50,82);
      
      // Fred is pulled over doing 108 kph in a 100kph zone – call the appropriate method

      d1.pulledOverSpeeding(100,108);

      // Fred is pulled over doing 102kph in a 80kph zone – call the appropriate method

      d1.pulledOverSpeeding(80,102);

		// display d1's details again

      d1.displayDriverDetails();
	}
}