3.69% is the change from 839 to 870
Calculation steps:
[( 870 - 839 ) ÷ 839] x 100 = 3.69%
Formula
Percentage change = [(870 - 839) / 839] x 100
Subtract the new number by the original number
870 - 839 = 31
31 ÷ 839 = 0.03694874851013111
0.03694874851013111 x 100 = 3.69%