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I checked your jotform http://www.myjotform.com/form/52183509767565 and I see what you were trying to achieve.
To calculate the score output into percentage format, you can use the formula like this
((Total) / 180) * 100
In your calculation widget it should look like this
You can test also my test form http://form.jotformpro.com/form/52267068274965?
I only answer each 1st option on all 8 questions (4 * 8 = 32)
If 32pts converted to percentage out of 180 pts... it is equal to 17.78%
I also noticed some issue in your conditional statements. I suggest you fix it as well by cleaning it of any deleted conditions.
Hope this help. Let us know if you need further assistance.