39.65% is the change from 623 to 870
Calculation steps:
[( 870 - 623 ) ÷ 623] x 100 = 39.65%
Formula
Percentage change = [(870 - 623) / 623] x 100
Subtract the new number by the original number
870 - 623 = 247
247 ÷ 623 = 0.39646869983948635
0.39646869983948635 x 100 = 39.65%