-83.64% is the change from 660 to 108
Calculation steps:
[( 108 - 660 ) ÷ 660] x 100 = -83.64%
Formula
Percentage change = [(108 - 660) / 660] x 100
Subtract the new number by the original number
108 - 660 = -552
-552 ÷ 660 = -0.8363636363636363
-0.8363636363636363 x 100 = -83.64%