308.43% is the change from 83 to 339
Calculation steps:
[( 339 - 83 ) ÷ 83] x 100 = 308.43%
Formula
Percentage change = [(339 - 83) / 83] x 100
Subtract the new number by the original number
339 - 83 = 256
256 ÷ 83 = 3.0843373493975905
3.0843373493975905 x 100 = 308.43%