326.36% is the change from 129 to 550
Calculation steps:
[( 550 - 129 ) ÷ 129] x 100 = 326.36%
Formula
Percentage change = [(550 - 129) / 129] x 100
Subtract the new number by the original number
550 - 129 = 421
421 ÷ 129 = 3.2635658914728682
3.2635658914728682 x 100 = 326.36%