307.23% is the change from 83 to 338
Calculation steps:
[( 338 - 83 ) ÷ 83] x 100 = 307.23%
Formula
Percentage change = [(338 - 83) / 83] x 100
Subtract the new number by the original number
338 - 83 = 255
255 ÷ 83 = 3.072289156626506
3.072289156626506 x 100 = 307.23%