209.52% is the change from 126 to 390
Calculation steps:
[( 390 - 126 ) ÷ 126] x 100 = 209.52%
Formula
Percentage change = [(390 - 126) / 126] x 100
Subtract the new number by the original number
390 - 126 = 264
264 ÷ 126 = 2.0952380952380953
2.0952380952380953 x 100 = 209.52%