-89.15% is the change from 645 to 70
Calculation steps:
[( 70 - 645 ) ÷ 645] x 100 = -89.15%
Formula
Percentage change = [(70 - 645) / 645] x 100
Subtract the new number by the original number
70 - 645 = -575
-575 ÷ 645 = -0.8914728682170543
-0.8914728682170543 x 100 = -89.15%