9.88% is the change from 840 to 923
Calculation steps:
[( 923 - 840 ) ÷ 840] x 100 = 9.88%
Formula
Percentage change = [(923 - 840) / 840] x 100
Subtract the new number by the original number
923 - 840 = 83
83 ÷ 840 = 0.0988095238095238
0.0988095238095238 x 100 = 9.88%