-87.67% is the change from 649 to 80
Calculation steps:
[( 80 - 649 ) ÷ 649] x 100 = -87.67%
Formula
Percentage change = [(80 - 649) / 649] x 100
Subtract the new number by the original number
80 - 649 = -569
-569 ÷ 649 = -0.8767334360554699
-0.8767334360554699 x 100 = -87.67%