30.85% is the change from 671 to 878
Calculation steps:
[( 878 - 671 ) ÷ 671] x 100 = 30.85%
Formula
Percentage change = [(878 - 671) / 671] x 100
Subtract the new number by the original number
878 - 671 = 207
207 ÷ 671 = 0.30849478390462
0.30849478390462 x 100 = 30.85%