21433.33% is the change from 3 to 646
Calculation steps:
[( 646 - 3 ) ÷ 3] x 100 = 21433.33%
Formula
Percentage change = [(646 - 3) / 3] x 100
Subtract the new number by the original number
646 - 3 = 643
643 ÷ 3 = 214.33333333333334
214.33333333333334 x 100 = 21433.33%