-5.56% is the change from 90 to 85
Calculation steps:
[( 85 - 90 ) ÷ 90] x 100 = -5.56%
Formula
Percentage change = [(85 - 90) / 90] x 100
Subtract the new number by the original number
85 - 90 = -5
-5 ÷ 90 = -0.05555555555555555
-0.05555555555555555 x 100 = -5.56%