-45.56% is the change from 90 to 49
Calculation steps:
[( 49 - 90 ) ÷ 90] x 100 = -45.56%
Formula
Percentage change = [(49 - 90) / 90] x 100
Subtract the new number by the original number
49 - 90 = -41
-41 ÷ 90 = -0.45555555555555555
-0.45555555555555555 x 100 = -45.56%