50% is the change from 126 to 189
Calculation steps:
[( 189 - 126 ) ÷ 126] x 100 = 50%
Formula
Percentage change = [(189 - 126) / 126] x 100
Subtract the new number by the original number
189 - 126 = 63
63 ÷ 126 = 0.5
0.5 x 100 = 50%
Example