-85.52% is the change from 670 to 97
Calculation steps:
[( 97 - 670 ) ÷ 670] x 100 = -85.52%
Formula
Percentage change = [(97 - 670) / 670] x 100
Subtract the new number by the original number
97 - 670 = -573
-573 ÷ 670 = -0.8552238805970149
-0.8552238805970149 x 100 = -85.52%