39.97% is the change from 643 to 900
Calculation steps:
[( 900 - 643 ) ÷ 643] x 100 = 39.97%
Formula
Percentage change = [(900 - 643) / 643] x 100
Subtract the new number by the original number
900 - 643 = 257
257 ÷ 643 = 0.39968895800933124
0.39968895800933124 x 100 = 39.97%