209.3% is the change from 129 to 399
Calculation steps:
[( 399 - 129 ) ÷ 129] x 100 = 209.3%
Formula
Percentage change = [(399 - 129) / 129] x 100
Subtract the new number by the original number
399 - 129 = 270
270 ÷ 129 = 2.0930232558139537
2.0930232558139537 x 100 = 209.3%