12.45% is the change from 819 to 921
Calculation steps:
[( 921 - 819 ) ÷ 819] x 100 = 12.45%
Formula
Percentage change = [(921 - 819) / 819] x 100
Subtract the new number by the original number
921 - 819 = 102
102 ÷ 819 = 0.12454212454212454
0.12454212454212454 x 100 = 12.45%