-80.91% is the change from 660 to 126
Calculation steps:
[( 126 - 660 ) ÷ 660] x 100 = -80.91%
Formula
Percentage change = [(126 - 660) / 660] x 100
Subtract the new number by the original number
126 - 660 = -534
-534 ÷ 660 = -0.8090909090909091
-0.8090909090909091 x 100 = -80.91%