-21.74% is the change from 115 to 90
Calculation steps:
[( 90 - 115 ) ÷ 115] x 100 = -21.74%
Formula
Percentage change = [(90 - 115) / 115] x 100
Subtract the new number by the original number
90 - 115 = -25
-25 ÷ 115 = -0.21739130434782608
-0.21739130434782608 x 100 = -21.74%