39800% is the change from 1 to 399
Calculation steps:
[( 399 - 1 ) ÷ 1] x 100 = 39800%
Formula
Percentage change = [(399 - 1) / 1] x 100
Subtract the new number by the original number
399 - 1 = 398
398 ÷ 1 = 398
398 x 100 = 39800%
Example