-79.72% is the change from 503 to 102
Calculation steps:
[( 102 - 503 ) ÷ 503] x 100 = -79.72%
Formula
Percentage change = [(102 - 503) / 503] x 100
Subtract the new number by the original number
102 - 503 = -401
-401 ÷ 503 = -0.7972166998011928
-0.7972166998011928 x 100 = -79.72%