54.88% is the change from 645 to 999
Calculation steps:
[( 999 - 645 ) ÷ 645] x 100 = 54.88%
Formula
Percentage change = [(999 - 645) / 645] x 100
Subtract the new number by the original number
999 - 645 = 354
354 ÷ 645 = 0.5488372093023256
0.5488372093023256 x 100 = 54.88%