36.36% is the change from 638 to 870
Calculation steps:
[( 870 - 638 ) ÷ 638] x 100 = 36.36%
Formula
Percentage change = [(870 - 638) / 638] x 100
Subtract the new number by the original number
870 - 638 = 232
232 ÷ 638 = 0.36363636363636365
0.36363636363636365 x 100 = 36.36%