-83% is the change from 506 to 86
Calculation steps:
[( 86 - 506 ) ÷ 506] x 100 = -83%
Formula
Percentage change = [(86 - 506) / 506] x 100
Subtract the new number by the original number
86 - 506 = -420
-420 ÷ 506 = -0.8300395256916996
-0.8300395256916996 x 100 = -83%