519.4% is the change from 134 to 830
Calculation steps:
[( 830 - 134 ) ÷ 134] x 100 = 519.4%
Formula
Percentage change = [(830 - 134) / 134] x 100
Subtract the new number by the original number
830 - 134 = 696
696 ÷ 134 = 5.1940298507462686
5.1940298507462686 x 100 = 519.4%