4.6% is the change from 870 to 910
Calculation steps:
[( 910 - 870 ) ÷ 870] x 100 = 4.6%
Formula
Percentage change = [(910 - 870) / 870] x 100
Subtract the new number by the original number
910 - 870 = 40
40 ÷ 870 = 0.04597701149425287
0.04597701149425287 x 100 = 4.6%