4.64% is the change from 840 to 879
Calculation steps:
[( 879 - 840 ) ÷ 840] x 100 = 4.64%
Formula
Percentage change = [(879 - 840) / 840] x 100
Subtract the new number by the original number
879 - 840 = 39
39 ÷ 840 = 0.04642857142857143
0.04642857142857143 x 100 = 4.64%