28.96% is the change from 670 to 864
Calculation steps:
[( 864 - 670 ) ÷ 670] x 100 = 28.96%
Formula
Percentage change = [(864 - 670) / 670] x 100
Subtract the new number by the original number
864 - 670 = 194
194 ÷ 670 = 0.28955223880597014
0.28955223880597014 x 100 = 28.96%