-84.75% is the change from 669 to 102
Calculation steps:
[( 102 - 669 ) ÷ 669] x 100 = -84.75%
Formula
Percentage change = [(102 - 669) / 669] x 100
Subtract the new number by the original number
102 - 669 = -567
-567 ÷ 669 = -0.8475336322869955
-0.8475336322869955 x 100 = -84.75%