-89.35% is the change from 845 to 90
Calculation steps:
[( 90 - 845 ) ÷ 845] x 100 = -89.35%
Formula
Percentage change = [(90 - 845) / 845] x 100
Subtract the new number by the original number
90 - 845 = -755
-755 ÷ 845 = -0.893491124260355
-0.893491124260355 x 100 = -89.35%