-85.37% is the change from 670 to 98
Calculation steps:
[( 98 - 670 ) ÷ 670] x 100 = -85.37%
Formula
Percentage change = [(98 - 670) / 670] x 100
Subtract the new number by the original number
98 - 670 = -572
-572 ÷ 670 = -0.8537313432835821
-0.8537313432835821 x 100 = -85.37%