39.63% is the change from 646 to 902
Calculation steps:
[( 902 - 646 ) ÷ 646] x 100 = 39.63%
Formula
Percentage change = [(902 - 646) / 646] x 100
Subtract the new number by the original number
902 - 646 = 256
256 ÷ 646 = 0.39628482972136225
0.39628482972136225 x 100 = 39.63%