3.93% is the change from 840 to 873
Calculation steps:
[( 873 - 840 ) ÷ 840] x 100 = 3.93%
Formula
Percentage change = [(873 - 840) / 840] x 100
Subtract the new number by the original number
873 - 840 = 33
33 ÷ 840 = 0.039285714285714285
0.039285714285714285 x 100 = 3.93%