-82.87% is the change from 502 to 86
Calculation steps:
[( 86 - 502 ) ÷ 502] x 100 = -82.87%
Formula
Percentage change = [(86 - 502) / 502] x 100
Subtract the new number by the original number
86 - 502 = -416
-416 ÷ 502 = -0.8286852589641435
-0.8286852589641435 x 100 = -82.87%