12.21% is the change from 819 to 919
Calculation steps:
[( 919 - 819 ) ÷ 819] x 100 = 12.21%
Formula
Percentage change = [(919 - 819) / 819] x 100
Subtract the new number by the original number
919 - 819 = 100
100 ÷ 819 = 0.1221001221001221
0.1221001221001221 x 100 = 12.21%