54.57% is the change from 645 to 997
Calculation steps:
[( 997 - 645 ) ÷ 645] x 100 = 54.57%
Formula
Percentage change = [(997 - 645) / 645] x 100
Subtract the new number by the original number
997 - 645 = 352
352 ÷ 645 = 0.5457364341085271
0.5457364341085271 x 100 = 54.57%