-84.55% is the change from 660 to 102
Calculation steps:
[( 102 - 660 ) ÷ 660] x 100 = -84.55%
Formula
Percentage change = [(102 - 660) / 660] x 100
Subtract the new number by the original number
102 - 660 = -558
-558 ÷ 660 = -0.8454545454545455
-0.8454545454545455 x 100 = -84.55%