-87.18% is the change from 117 to 15
Calculation steps:
[( 15 - 117 ) ÷ 117] x 100 = -87.18%
Formula
Percentage change = [(15 - 117) / 117] x 100
Subtract the new number by the original number
15 - 117 = -102
-102 ÷ 117 = -0.8717948717948718
-0.8717948717948718 x 100 = -87.18%