40% is the change from 90 to 126
Calculation steps:
[( 126 - 90 ) ÷ 90] x 100 = 40%
Formula
Percentage change = [(126 - 90) / 90] x 100
Subtract the new number by the original number
126 - 90 = 36
36 ÷ 90 = 0.4
0.4 x 100 = 40%
Example