43.23% is the change from 643 to 921
Calculation steps:
[( 921 - 643 ) ÷ 643] x 100 = 43.23%
Formula
Percentage change = [(921 - 643) / 643] x 100
Subtract the new number by the original number
921 - 643 = 278
278 ÷ 643 = 0.432348367029549
0.432348367029549 x 100 = 43.23%