-95.81% is the change from 645 to 27
Calculation steps:
[( 27 - 645 ) ÷ 645] x 100 = -95.81%
Formula
Percentage change = [(27 - 645) / 645] x 100
Subtract the new number by the original number
27 - 645 = -618
-618 ÷ 645 = -0.958139534883721
-0.958139534883721 x 100 = -95.81%