-85.5% is the change from 669 to 97
Calculation steps:
[( 97 - 669 ) ÷ 669] x 100 = -85.5%
Formula
Percentage change = [(97 - 669) / 669] x 100
Subtract the new number by the original number
97 - 669 = -572
-572 ÷ 669 = -0.8550074738415545
-0.8550074738415545 x 100 = -85.5%