30.39% is the change from 645 to 841
Calculation steps:
[( 841 - 645 ) ÷ 645] x 100 = 30.39%
Formula
Percentage change = [(841 - 645) / 645] x 100
Subtract the new number by the original number
841 - 645 = 196
196 ÷ 645 = 0.30387596899224806
0.30387596899224806 x 100 = 30.39%