39.38% is the change from 645 to 899
Calculation steps:
[( 899 - 645 ) ÷ 645] x 100 = 39.38%
Formula
Percentage change = [(899 - 645) / 645] x 100
Subtract the new number by the original number
899 - 645 = 254
254 ÷ 645 = 0.3937984496124031
0.3937984496124031 x 100 = 39.38%