-83.07% is the change from 508 to 86
Calculation steps:
[( 86 - 508 ) ÷ 508] x 100 = -83.07%
Formula
Percentage change = [(86 - 508) / 508] x 100
Subtract the new number by the original number
86 - 508 = -422
-422 ÷ 508 = -0.8307086614173228
-0.8307086614173228 x 100 = -83.07%