-77.52% is the change from 645 to 145
Calculation steps:
[( 145 - 645 ) ÷ 645] x 100 = -77.52%
Formula
Percentage change = [(145 - 645) / 645] x 100
Subtract the new number by the original number
145 - 645 = -500
-500 ÷ 645 = -0.7751937984496124
-0.7751937984496124 x 100 = -77.52%