43.46% is the change from 642 to 921
Calculation steps:
[( 921 - 642 ) ÷ 642] x 100 = 43.46%
Formula
Percentage change = [(921 - 642) / 642] x 100
Subtract the new number by the original number
921 - 642 = 279
279 ÷ 642 = 0.43457943925233644
0.43457943925233644 x 100 = 43.46%