-76.52% is the change from 660 to 155
Calculation steps:
[( 155 - 660 ) ÷ 660] x 100 = -76.52%
Formula
Percentage change = [(155 - 660) / 660] x 100
Subtract the new number by the original number
155 - 660 = -505
-505 ÷ 660 = -0.7651515151515151
-0.7651515151515151 x 100 = -76.52%