648.19% is the change from 83 to 621
Calculation steps:
[( 621 - 83 ) ÷ 83] x 100 = 648.19%
Formula
Percentage change = [(621 - 83) / 83] x 100
Subtract the new number by the original number
621 - 83 = 538
538 ÷ 83 = 6.481927710843373
6.481927710843373 x 100 = 648.19%