34.89% is the change from 642 to 866
Calculation steps:
[( 866 - 642 ) ÷ 642] x 100 = 34.89%
Formula
Percentage change = [(866 - 642) / 642] x 100
Subtract the new number by the original number
866 - 642 = 224
224 ÷ 642 = 0.34890965732087226
0.34890965732087226 x 100 = 34.89%