646.99% is the change from 83 to 620
Calculation steps:
[( 620 - 83 ) ÷ 83] x 100 = 646.99%
Formula
Percentage change = [(620 - 83) / 83] x 100
Subtract the new number by the original number
620 - 83 = 537
537 ÷ 83 = 6.469879518072289
6.469879518072289 x 100 = 646.99%