Need Help With A < Formula

1.JPG

I'm having some trouble getting the current red box as pictured above to calculate correctly. Basically if the inputted data (Y 6.76) is less than 10 I should be in the green. Any suggestions on what type of formula to use so that whenever data is put in that is less than 10 I will get the correct percentage? The current formula in the red box cell is =IF($Y31>0,$Y31/$G31,"100%") Thank you!