39.94% is the change from 641 to 897
Calculation steps:
[( 897 - 641 ) ÷ 641] x 100 = 39.94%
Formula
Percentage change = [(897 - 641) / 641] x 100
Subtract the new number by the original number
897 - 641 = 256
256 ÷ 641 = 0.3993759750390016
0.3993759750390016 x 100 = 39.94%