Help me please stressed over what final grade will be?

Ok so i took my final the other day at school and the final is worth 15 percent of your grade. As of now without the final test included in my grade I have a 73% in that class in order for me to pass the class i will need a 70% grade or higher because a 69% or lower is failing grade. So i was wondering what would i have to make on the finals test to at least get a passing grade which would be a 70% or higher in the class as the final grade? (gosh i am so stressed i have a headache because i don't want to fail this class and have to go to summer school. Pleaseeeeee helpppp me