Help with points Algorithm?

Hi there

I wrote some code that gives you a certain amount of stars on level completion.

this is how my game works so far

if (finishTime < 60) {

                 Time1 = true;

             } if (finishTime <= 70) {

                 Time2 = true; and so on......

so if time 1 is called

if (Time1)

             {
             
              
                 oneStarGUI.enabled = true;
                 twoStarGUI.enabled = true;
                 threeStarGUI.enabled = true; 
                 finishTimeText.text =  textTime; 
                    Handheld.Vibrate ();                          
                 finishTimeText.text = "Your Time       "+ textTime;
                 
                 
                 scoreFinalText.text = "Score:" + scoreFinal;
                 
                 
                 yield WaitForSeconds(7);
                 Application.LoadLevel(5); 
   
             }

.........

it basically enables the GUI textures that will give you the relevant amount of stars and start next level...

i get the Time data from a standard stopwatch.

The part i am struggling with is that i want to implement a numeric score as well as the GuiStars so that it adds more competition to the game.

i want to say

If completed in 40 seconds or less you get the relevant stars as well as a standard level completion score of 500

but to be more specific, if the allocated time for the level is eg: 40seconds and the player finishes in 34seconds, i want to give them a score that takes the remainder of 34 seconds and multiplies it by 4

like this: - Time Given For Completion 40 (User receives Stars + 500 level completion points) - User completed in 34 - so 40 - 34 = 6 x 4 = 24 + 500 (level completion bonus points) = 524

i also need help with adding the standard 500 points on completion to the final score

sorry for the crap way of explaining

Thanks a million in advance :)

Tremayne