-79.92% is the change from 508 to 102
Calculation steps:
[( 102 - 508 ) ÷ 508] x 100 = -79.92%
Formula
Percentage change = [(102 - 508) / 508] x 100
Subtract the new number by the original number
102 - 508 = -406
-406 ÷ 508 = -0.7992125984251969
-0.7992125984251969 x 100 = -79.92%