31900% is the change from 1 to 320
Calculation steps:
[( 320 - 1 ) ÷ 1] x 100 = 31900%
Formula
Percentage change = [(320 - 1) / 1] x 100
Subtract the new number by the original number
320 - 1 = 319
319 ÷ 1 = 319
319 x 100 = 31900%
Example