381.93% is the change from 83 to 400
Calculation steps:
[( 400 - 83 ) ÷ 83] x 100 = 381.93%
Formula
Percentage change = [(400 - 83) / 83] x 100
Subtract the new number by the original number
400 - 83 = 317
317 ÷ 83 = 3.819277108433735
3.819277108433735 x 100 = 381.93%