-98.79% is the change from 660 to 8
Calculation steps:
[( 8 - 660 ) ÷ 660] x 100 = -98.79%
Formula
Percentage change = [(8 - 660) / 660] x 100
Subtract the new number by the original number
8 - 660 = -652
-652 ÷ 660 = -0.9878787878787879
-0.9878787878787879 x 100 = -98.79%