Score conversion help needed

Hi all! I am not a driver, but our club has many drivers. THis summer we gave points for our year end awards for a show held by a different organization. Well, WE calculate driving scores just like dressage scores - that is, points given divided by possible points equals score. They, of course, used the penalty points formula at the bottom of the tests.

I have to convert them. I am usually pretty good at math, but since I have never scored a driving test this way, I am a little lost. All I have are the penalty point scores, not the points they earned on the test. (I do have access to blank tests with the formulas...)

Can someone help?

Loretta