81.69% is the change from 355 to 645
Calculation steps:
[( 645 - 355 ) ÷ 355] x 100 = 81.69%
Formula
Percentage change = [(645 - 355) / 355] x 100
Subtract the new number by the original number
645 - 355 = 290
290 ÷ 355 = 0.8169014084507042
0.8169014084507042 x 100 = 81.69%