-84.14% is the change from 643 to 102
Calculation steps:
[( 102 - 643 ) ÷ 643] x 100 = -84.14%
Formula
Percentage change = [(102 - 643) / 643] x 100
Subtract the new number by the original number
102 - 643 = -541
-541 ÷ 643 = -0.8413685847589425
-0.8413685847589425 x 100 = -84.14%