673.49% is the change from 83 to 642
Calculation steps:
[( 642 - 83 ) ÷ 83] x 100 = 673.49%
Formula
Percentage change = [(642 - 83) / 83] x 100
Subtract the new number by the original number
642 - 83 = 559
559 ÷ 83 = 6.734939759036145
6.734939759036145 x 100 = 673.49%