-79.64% is the change from 501 to 102
Calculation steps:
[( 102 - 501 ) ÷ 501] x 100 = -79.64%
Formula
Percentage change = [(102 - 501) / 501] x 100
Subtract the new number by the original number
102 - 501 = -399
-399 ÷ 501 = -0.7964071856287425
-0.7964071856287425 x 100 = -79.64%