638.1% is the change from 84 to 620
Calculation steps:
[( 620 - 84 ) ÷ 84] x 100 = 638.1%
Formula
Percentage change = [(620 - 84) / 84] x 100
Subtract the new number by the original number
620 - 84 = 536
536 ÷ 84 = 6.380952380952381
6.380952380952381 x 100 = 638.1%