Timer will not reset properly.

In the game I am making, there are "dummies" that the player shoots at. When the player shoots them they disappear. The game is a time trial to shoot all of the dummies as fast as possible.

Here is my problem:

I can't get the timer to reset. I have gotten it to stop when all of them are shot, but when i press "R" to reset, the timer goes back to zero when I cross the trigger, but when i finish the map for the second time, the time just adds on with the previous attempt.

I have figured out through hours of research that Time.time is my problem. I cant reset Time.time to zero. I have tried many different things trying to get it to reset correctly and I have run out of ideas.

I am posting my code on this question as well as a YouTube video of me explaining my problem. Thanks in advance for your help :D

YouTube Link:
Shooting Frenzy Help Video

Sorry for the bad audio... it didn't record correctly...

 using UnityEngine;
 using System.Collections;
 
 public class GameControllerTime : MonoBehaviour {
 
     private static int dummyAmount;
     private static float startTime, endTime;
     private static float elapsedTime;
 
     public string currentLevel;
 
     public GUIStyle timer;
     public Rect rect = new Rect(300, 25, 100, 200);
 
     // Use this for initialization
     void Start () {
     
         dummyAmount = GameObject.FindGameObjectsWithTag ("Dummy").Length;
         startTime = 0;
 
     }
 
     public static void RemoveDummy(){
         
         /* I have another script attached to the dummies that triggers this function*/
 
         dummyAmount--;
         
         
         if (dummyAmount <= 0) {
 
             endTime = Time.time;
             elapsedTime = endTime - startTime;
 
         }
         
     }
 
     void Update () {
 
         if (startTime > 0)
         {
             elapsedTime = Time.time - startTime;
         }
 
         /* This reloads the level when "r" is pressed, it could go in another scrpit if needed.
                      It resets the dummies but not the timer. */
 
         if (Input.GetKeyDown (KeyCode.R)) {
 
             Application.LoadLevel (currentLevel);
         
         }
 
     }
 
 
 
     void OnTriggerEnter(){
 
         /* walk through trigger to start timer */
 
         startTime = Time.time;
 
     }
 
     void OnGUI(){
 
         /*puts timer on screen*/    
 
         if (dummyAmount >= 1) {
             GUI.Label (rect, (elapsedTime.ToString ("F2")), timer);
             rect.x = 20f;
             rect.y = 20f;
             }
         else {
             GUI.Label (rect, (endTime.ToString ("F2")), timer);
             rect.x = 20f;
             rect.y = 20f;
         
         }
     }
 
 }