64100% is the change from 1 to 642
Calculation steps:
[( 642 - 1 ) ÷ 1] x 100 = 64100%
Formula
Percentage change = [(642 - 1) / 1] x 100
Subtract the new number by the original number
642 - 1 = 641
641 ÷ 1 = 641
641 x 100 = 64100%
Example