28.51% is the change from 670 to 861
Calculation steps:
[( 861 - 670 ) ÷ 670] x 100 = 28.51%
Formula
Percentage change = [(861 - 670) / 670] x 100
Subtract the new number by the original number
861 - 670 = 191
191 ÷ 670 = 0.28507462686567164
0.28507462686567164 x 100 = 28.51%